age doesn't matter, be careful

[@bwasman8409]

I have never seen simplicity made so complicated!

[@adrianakacka5516]

5!

[@michaelgrass1788]

You are soooo right. That's what we learned jet in Basic Schools.

[@chucklindenberg1093]

To be this guy spelt the name of his channel as first name Brian but calls it Brain Logic so.....

[@srajjad]

Teachers like this scared away many students to learn mathematics.

[@sharonj3979]

Old school here. I knew the answer was 120 easily done in my head but I didn't know what 5! point was. 😅

[@grandmalizard4056]

Neither did I

[@sigsin1]

Same

[@GeoffHome-u6r]

@@sharonj3979 5 ! Is 5 factorial: 5x4x3x2x1

[@johnhowe3772]

5! Is an "imaginary" or "theoretical" in advanced maths - SqRt -5 also written as i(SqRt)5

[@GeoffHome-u6r]

@ A shriek/exclamation [!] means factorial, [i] is the sqrt(-1)

[@trichmalgam9985]

How to confuse and turn people off maths in 7 minutes .too bloody clever for his own good

[@bigdog3628]

this is actually a very good trick that should be used IF you are using multiple choice with mathematics. I have always said multiple choice has no business in math as it does NOT prove that the student knows the work. IE they could "luck" their way into the right answer.

[@paulfrost8952]

@@bigdog3628We called it, vote for Joe maths answers when they told us there was a whole paper with them. You had a 25% chance of getting the answer right out of an a,b,c or d choice and that could be as high as 50% if you could see the red herring answers, so not a very good test just a cheap one for the examiner/computer to mark!

[@alialfahhamalfahham9695]

you can simply write 120 in stead of 5!..any way the answer is simple 120

[@brettbuck7362]

This video has a foolish answer set, just trying to be deceptive on a trivial arithemetic problem solved by 8 years olds easily. Factorial has exactly nothing to do with this problem, and ,it doesn't have any of the other (also deceptive) use of the obsolete "divide" symbol and poorly stated order of operations. A lot of these videos are made by people who are just pedantic and do not know how to use math (or in this case, trivial arithmetic) in a practical sense.

[@randyjones280]

He's an idiot

[@petersearls4443]

@@brettbuck7362 actually the obelus while not recommended is far from obsolete. You will find it used on the divide key of most calculators. Well at least google calculator, wolfram alpha, iPhone and iPad.

[@Joe-d4e]

Stop trying to be super and let others learn.

[@bigdog3628]

If this were an actual exam and you did NOT answer 5! AND explain that 5! means 5 * 4 * 3 * 2 * 1, then yeah the question would and should be marked wrong. (Only because of Multiple choice and the 5! was the given choice.)

[@Ilese-xy8on]

Do the bracket first: division first then add the 4 ... 40/2=20 ... 20+4 answer 24. Now multiply 24 by 5. Answer 5(4+40/2)=120.

[@kenattwood8060]

Spot on ... This is what BODMAS tells us.

[@Ilese-xy8on]

@kenattwood8060 Thank you Ken, all the best.

[@manuelvalencia9407]

Exactly right! Remember "PEMDAS". You can do it in your head.

[@Dybicus]

Correct!

[@pennhill5459]

thats what I got, but he doesn't speak english

[@wallyjohns7312]

120, let's not make it so complicated.

[@suzanneturley4433]

I was ungraded in my Maths exam but I got a 110 within seconds. You work from left to right but do the bracketed sum first. 5 (4 + 40 divided by 2) = 22, then multiply by 5 which is 110. No wonder I couldn’t do maths at school if it was explained in that convoluted way. Only to end up with the wrong answer.😵‍💫

[@barbmcbride2653]

…but 110 is wrong!

[@ugh_not_him]

How to turn a 15 second maths problem into a 7 minute crap fest.

[@yasmine0466]

And expect many 👍's 😂

[@angelaramosmelo6247]

5x(4+20) 5x24=120

[@ronaldwashington5715]

Exactly

[@Tay-pc7de]

5(4+40÷2) 5(44÷2=22) 5×22=110 😂

[@echohotel4963]

You added before divided. Incorrect.

[@Darkpoetic]

​@@Tay-pc7deit's 40 ÷ 2 = 20 + 4 = 24 × 5 = 120

[@krishnarajanv953]

The explanation is verbose and boring !

[@manuelvalencia9407]

Yup! Boring.

[@paulbowler2760]

Applying BODMAS - if you believe that the divisor 2 applies to both 40 and 4 then the correct answer is a) 110. However, if you believe that the divisor 2 applies only to 40, them the correct answer is 120! I support the second solution. To apply the divisor 2 to both 4 and 40, these numbers must be bracketed together - ie 5((4+40)/2) = 5 x 22 = 110!

[@barbmcbride2653]

…and that would be the incorrect answer! There’s only one answer, that’s 120, whether you write it 5! or 120.

[@timbrandis1151]

It's 120 & 30 seconds brain effort in Australia.

[@karkigann]

Yes, but the answer is upside-down.

[@kjagadeesh2015]

5 seconds in bengaluru INDIA !!!😂

[@DrFrankNStein-sf2ww]

15 seconds in Germany. What confused me most was that the right answer wasn't among the choices.

[@michalwandas3743]

This eqaution is for the kids in elementary school 3rd or 4th grade at max.

[@manuelvalencia9407]

Same here. 30 seconds in my head.

[@drahcirnevarc9152]

I have a Philosophy PhD but only O-level maths from 45 years ago, so although I got the right answer - 120 - I didn't know about factorials until the gentleman in the video enlightened me.

[@therighthandmann]

The audio in the explanation was VERY difficult to hear clearly, so It almost makes it a trick question, but I get it.

[@russwaddel08]

It is called PEMDAS, people. Everything in the parentheses is done first, in order of division then addition, which you get 24. Then you multiply by 5. The answer is 120. You can write "5!," but that doesn't matter much.

[@echohotel4963]

5! and 120 are the same thing. He says 'many people don't get it right' but that's because he didn't ask us to find the factorial to solve.

[@GeoffHome-u6r]

@@russwaddel08 BODMAS actually

[@anthonyblue100]

In my day we learned math using brackets and parentheses, so there was no confusion about sequence of operations. But that was too simple. They had to make it complicated to keep kids learning down.

[@billmcleangunsmith]

If I take simple math and make it complicated, people will think I am smart. Or an idiot.

[@perlman-t2g]

He's a smart ass.

[@edwardmaylor5714]

over done Keep it simple

[@emihayashi7725]

​@@edwardmaylor5714, Too verbose!

[@harrietkinloch7451]

Keep life simple!

[@wonderstar1234]

Using BODMAS rule Bracket Open, Division. Multiplication, Addition, subtraction 5(4 + 40/2) Bracket Open 5(4 + 40/2) = 20 + 200/2 Division = 20+ 200/2 = 20 + 100 Addition = 20 + 100 = 120

[@mkimber7041]

I think that's how we learned to do it. Back then, it was called "New Math!"🤭

[@simonkormendy849]

First thing we do is what's in the brackets, so, 4+40=44, next, 44/2=22, and then 5X22=110.

[@thisabledwoman3637]

And that’s how you get the wrong answer. It’s actually 120 or 5!

[@thisabledwoman3637]

You have to do the division within the parentheses first so 40/2=20 +4=24x5=120

[@kennyhalltotga2272]

I did this mentally very easily. The log explanation are a clear expression that simplified the process. Sometimes the log explanation confuses me.

[@joannparker1977]

Man. I came up with 120. And it wasn't on the list of possible outcomes. Now! I understand. I did see the 5! And thought nothing about it. It's been a long time for me. I'm 64 and I'm obviously rusty!!

[@williamfleckles]

Never heard of "factorial" before this video. It's like walking into an advanced math class and taking a test about something you were never taught. I had the right answer and would have written down "d) 120. As you might" As you might have guessed, I did not get along with a lot of my teachers.

[@sekharb6651]

5x(4+20)=5×24=120

[@happyhapley]

Nicely explained by the tutor. Once you know the order, it's easy to solve. In this case, Bracket, Division, Addition, then Multiplication by the 5 to get 120.

[@victorstalick5528]

should be 120. Use Parenthesis to establish the order, 5*(4 +(40 -2)) makes it easier.

[@terranceburrs5832]

5! is 120

[@berendoballbomber5977]

I time Traveled day dreaming in my 8 grade Algebra class from 1967 never learned about 5! - 120 Factorial, I need to get back to turn this in my class before it's home work I hope I can remember this!

[@coloradorocky1298]

Most of you started left to right. The order of operations is PEMDAS. Parenthesis first, exponents (none here) next, Multiplication next (none here) then division. The 4th step is division, you start from right to left on this problem, division …. Then, Adding and subtraction. You always follow PEMDAS.

[@Kepi_Kei]

And this is why I had to take a general math class to graduate high school. I had A's in just about everything else but understanding math escaped me.

[@jamescampbell2521]

If division comes before multiplication ,left to right, you would do the division part of the problem first. I`m 70 & just learned this.🙄

[@allenporter6586]

All division can be turned into multiplication by the reciprocal (multiplicative inverse), just like all subtraction can be turned into addition using additive inverses, then PEMDAS becomes PEMA. Also PEMDAS will kill you if you don't treat numerators and denominators as having "invisible" parantheses as 2+6/2 =5 while (2+6)/2 =4 yet it is often written without any parantheses in equation editors.

[@robertpolnicky7702]

I think there needs to be parenthesis around tge 40 divided by 2 pr the 4 plus 40. Or a line under the 4 plus 40 with 2 underneath or or a line under 40 with 2 undernearh. Thats why people are missing it i tbink.

[@JasonBarth-f4m]

Logically it's a pemdas problem. You divide 40 by 2 to get 20. Then you add 4 to the equation to get 24 then multiply the 5 in the brackets to get 120. But 5! Is something new. It must be a sum number in it's own power.

[@DG31000]

@@JasonBarth-f4m 5!=120. The correct answer is written in factorial form for some stupid reason. When you see a number with the exclamation point next to it this means that you must multiply that number by all positive integers less than it down to 1. For example 5! Is 5×4×3×2×1=120.

[@joybalducci215]

@@DG31000thanks for explaining that portion. I figured out the 120 but have never seen 5! and he did not explain it as you just have. Thanks!

[@DG31000]

@@joybalducci215 no problem.

[@emihayashi7725]

Simple explanation in less than 100 words 👍

[@russohj]

It is (4 + 40/2) 5 = 110. Solve within parentheses first, and everything to the left of a division sign is the numerator (above) and to the right the denominator (below). You add 4 + 40, So 44 is divided by 2 then multiply by 5. Basic math.

[@anthonymosiejczuk8945]

I said the same the answer is A 110

[@Ilese-xy8on]

Using the PEMDAS rule: Parentheses, Exponents, Multiplication or Division (work left to right), Addition or Subtraction (work left right). So go to the Parenthesis first and using the rest of the PEMDAS rule, 40/2 = 20, then add the 4, which gives an answer of 24. Now multiply 24 by 5, this gives and answer 120. 120 is not shown as a possible answer, so we are lead to explore the meaning of 5! (5 factoral). 5! is another way of writing 120, as follows 5 x 4 x 3 x 2 x 1 .. 5 x 4 = 20, 20 x 3 = 60, 60 x 2 = 120, 120 x 1 =120. The answer is b 120 converted to 5!.

[@melonjoy2905]

I'm totally confused because some professors say solve the equation from left to right where he said (not Brain Logic) 4+40=44 divide by 2 equals 22 times 5= 110. My question is: when you have an addition and division which do you solve first in this type of equation 4+40 or 40 divide by 2? I seem to get this step wrong every time thank you.

[@richardalbritton2862]

P- parentheses E- exponents M/D= multiplication/ division (same priority, so when both exist... solve left to right, unless one happens to be in parenthese...then, solve that first. A/S- addition/subtraction (also the same priority to eachother... follow same rule as M/D.

[@kimberlyaustin6677]

Melonjoy, the way you described is exactly how ACTUAL math was taught in school. So, yes, according to everyone except this guy, the correct answer is 110

[@MrMousley]

Multiplication/Division are done before Addition/Subtraction

[@didirobert3657]

That is exactly how I worked the problem and got the same answer. 😮

[@coloradorocky1298]

In order of operations, PEMDAS…. You start from left to right in parenthesis, You do multiplication then division always first after Parenthesis & exponents,….BUT if add or subtract are first in parenthesis, then you start from right to left instead because you multiplication and division first. Since adding is first here, you have to start from the right instead to keep the order of operations with PEMDAS.

[@MidnightBlackness]

It's 120, why isn't that option shown on here?:

[@tammielee6743]

I enjoyed this, and learned something.

[@mathland2263]

👌🏻👌🏻

[@tammyhiggins1013]

Why would you not have the correct answer as an option??

[@mangaiyarkarasicooking3795]

120

[@raineh4625]

Could you do one on , more , examples of factorial? Thanks.

[@richardalbritton2862]

3!=6 1×2×3=6 7!=5,040 1×2×3×4×5×6×7=5,040 10!=3,628,800 1×2×3×4×5×6×7×8×9×10= 3,628,800

[@petersearls4443]

Then you have double factorial. It means you do the same as factorial but you only use the integers that match the number in the double factorial as to odd or even. Example 7!! Would be 1*3*5*7. And 8!! Would be 1*2*4*6*8. I hope that helps.

[@antoinemozart243]

You can't put two different operators between a pair of brackets. It isn't allowed.

[@frandlyalexander3946]

This guy is just saying the same thing over and over get to the dam point already! He's talking so much that I don't even care to hear or see the solution anymore even tho I know the answer. All of the talking repeating is just too much!

[@jdowns7636.]

Whats a fractorial and is the rule to know that was the answer, can you do video on that rule

[@masoaresish]

5! = 5x4x3x2x1= 120 5(4+40÷2) 5(4+20) 5x24=120 5x4x3x2x1=120 answer B 5!

[@yvonnesookdeo5358]

My apologies! Most of us completed the math problem before you; therefore, the 110 troubled us. Now that I watched to the completion, I understand why the correct answer, 120 is not amount the fictitious numbers. Thanks for your clarification and explanation. Hope you understood our concerns and that only smart asses could have made this unfortunate assumption. Love your explanation.😂😂🙏🏾👌🏽❤️

[@bahntunnelportal]

5!

[@grandmalizard4056]

110 is the only answer that makes sense to me. 120 isn't among a) b) c) answers. How's one to know to go right to left? But 120 isn't among the answer choices. New math expects one to know whether to multiply, subtract or add, etc...

[@pitiedvod]

Is it really new math when the rules that defined orders of operations were put down in the 1600s and PEMDAS itself has been around for over a century?

[@janeferguson191]

I don’t understand factorials. Surely the answer is just 120?

[@jamiegagnon6390]

It is a multiple guess question. You are restricted to picking an answer from the available choices. Arithmetically, the answer is obviously 120 not 110 or 40, so your choice must be 5!. Sherlock Homes' adage applies; you eliminate the two impossible(wrong) answers leaving the one you don't comprehend as the correct one.

[@rlshafer7115]

When you use the distributive method, the answer becomes 40 So 5(4+40÷2) becomes (5x4) + (5x40) ÷ (5x2) which becomes 20 + 200 ÷ 10 which becomes 20 + 20 which equals 40

[@mikemassey7403]

B5!

[@ellebahe8729]

If the answer is 120, why ia it not visible on the screen as a option? Is it (d) and you failed to display it?

[@niranjanchakraborty1139]

Ans=5(4+40÷2)=5(4+20)=5×24=120=(5×4×3×2×1)=5!.

[@rolsta2871]

You always start with what is inside the brackets. Multiplication sign?

[@angelaramosmelo6247]

B)5!

[@metalmark1214]

Pretty easy. You do the division inside the parentheses first, 20, add 4, 24 and multiply by 5 equals 120. 5! =120, Answer B

[@Teabagsforlife]

Cool trick question. I don't get why people are mad in the comments. It's just for fun and it actually teaches people about factors.

[@nikkitytom]

Be fair. There are two correct answers. The usual familiar one is 120. The rarely seen one is the factorial 5! Why make a simple problem so confusing?

[@GeoffHome-u6r]

This takes about 10sec to evaluate and nearly 10min of unintelligible babble to explain

[@calmronalavi4061]

Quite so. Fast talking doesn't mean you are speaking a second (to your mother tongue) language well. Combine the fast talking to your soft speaking and it is an unintelligible babble.

[@GeoffHome-u6r]

@ precisely

[@juangamazo5781]

What happened to brackets? [40/2] then parenthesis, then multiplication. The equation can only be used by math teachers to teach students the order of math operations. It won't send a rocket to the moon, create a building, figure out the orbit of an alien planet, or balance my check book. So now I know how useless my math skills are. Thanks.

[@Ilese-xy8on]

Order of Operations: Parentheses, Exponents, Multiplication or Division ( working from left to right), Addition or Subtraction (working from left to right). Therefore, we must do all processes within the Parenthesis first, within the Parenthesis Division must be carried out before addition, thus 40/2 = 20, then 20 + 4 = 24. Now we have dealt with everything inside the Parenthesis we can now multiply 24 by 5, which gives the answer 120. Since 120 does not appear as a possible answer in this form we are lead to explore 5! since the other answers are incorrect according to the PEMDAS rule. 5! (5 factoral) means 5 x 4 x 3 x 2 x 1 ... 5 x 4 = 20, 20 x 3 = 60, 60 x 2 = 120, 120 x 1 = 120.

[@Fng_1975]

So we don’t distribute anymore?

[@MarcusGray-b3f]

Yes, we can distribute, but there are no variables. So why make it easier to make a mistake? This is just a number so it is easy 😊

[@ggb1377]

b). 5! 5! = 120

[@Couldabean]

If 120 isn't the answer then 🤷‍♂️.

[@Justyouraverageguy172]

Honestly if this was an SAT question I would still get the 120 but not know what to do because of the 5!

[@richardalbritton2862]

Buy it is! The "!" is the symbol for "factorial". That means you take the product (multiplications answer) of each full, non-negative interger up to the number before it. Here... the number is 5, so... 1×2×3×4×5.... 1×2=2 2×3=6 6×4=24 24×5=120 So "5!"= 120

[@jetlee44]

120 is the answer

[@wiseoldwitch4874]

110 is correct

[@shkeen57]

No it isn't

[@geraldhaid7794]

🎉🎉 120 🎉🎉 😎

[@jfidelis46]

PEMDAS was pounded in my head by my math teachers. They always said to follow that rule, NO MATTER WHAT! Use Please Excuse My Dear Aunt Sally to remember the order of ops. I came up with 120, which is the same as 5! (factorial).

[@wayneclark6624]

is it 110 ???

[@petersearls4443]

No. 120 divide first.

[@tvsmurali2130]

And 40+4 44/2 _22*5 - 110 answer

[@krisrenaldi2602]

The answer is 110, this isn't millennial math!!! It's for adults, very simple!!!!

[@petersearls4443]

@@krisrenaldi2602 no it is 120. Divide first then add then multiply. 5(4+40÷2)→5(4+20)→5*24=120.

[@richardalbritton2862]

@@krisrenaldi2602 millennials math? Are you on crack? I learned the order of operations 40 years ago.

[@bertblankenstein3738]

Please tell me I'm not the only one. Why is the channel name Brian Logic? Is the content creator called Brian? Did they really mess this up and spell Brian instead of Brain?

[@leopoldopenaranda936]

A 110

[@richardalbritton2862]

Didn't finish watching the video, huh😂

[@dateland-twopalmspress755]

why would he want to mess with people's minds? I got 120 and wondered why it wasn't listed -- who is supposed to know that an exclamation point has an arcane functional meaning?

[@petersearls4443]

It really isn’t arcane. When you have probability problems or calculations where you have to multiply sequences. Factorials are commonly used in a variety of calculations and mathematical fields, especially in problems involving counting, probability, and combinatorics.

[@margaretwelsh6445]

The answer is 120

[@barbarasnetiker3452]

In all of my 73 years of life, I have NEVER seen an exclamation point used in math! Anyway, I got it correct

[@eugeniapryor45]

the answer is B 5!

[@melindadelancey249]

I multiply 5 times 20 is 100+5×4 is 20. Take both answers and Add them together and you get 120.

[@MAKNT-x3k]

110

[@kenjordan5750]

Why do I have to figure out the problem AND the answer?

[@sandrastorer5628]

I did learn something new. I'm 68 and have never seen something like 5! or heard of factorials.

[@robertholan5244]

I am older than you by a decade and had factorials in grade school.

[@todradmaker4297]

@@robertholan5244 What is the purpose of factorials?

[@Tim_the_Enchanter]

Why is simple arithmetic being made to seem so complicated?

[@parimalbose1394]

As per BODMAS division is higher in order than multiplication, whereas you mention that multiplication should be higher. Pl confirm.

[@mohameddheeg5838]

Always start with the inside comma 4+40 =44/2 =22 then multiply 22 X 5=110

[@mnkeyd]

This is the first time I have used Factorials since I have learned it 15 years ago...

[@davidmegeath1353]

Love your math challenges!

[@shemiahwalker]

Thank you

[@DudeRanchDan]

Somehow I made it all the way to geometry in tech school and never heard of factorials. I think the level of math where factorials is introduced must be very subjective.

[@anthonymosiejczuk8945]

44 ÷ by 2 = 22 × 5 = 110

[@felicjandulski4986]

And where is the multiplication operator before the bracket? After all, this is arithmetic, not algebra. The lack of an operator is a factor that confuses people. Some calculators treat such a notation like additional brackets.

[@waynejacksongalloway3768]

Great

[@henniedupreez125]

Excellent explanation Brian! I wish you were my math's teacher and not old Poon at Grey College.

[@gerlindehofmann1067]

Oh, a genius!!!!

[@JRAPTORTHEGOAT]

Real,old school here Wrong answer the correct answer is 110

[@bethross2566]

The beauty of maths.

[@retiredbobsday.5642]

Because of expansive problems. That's why instructors wanted you to show your work

[@RevelingDragon]

Showing you work is disrespectful to those capable. They made you show it to convince you that you're no better than everyone else. In truth you were.

[@musicismyfriend7919]

​@@RevelingDragonI didn't know what the explanation point meant. But then again, I'm not an erudite scholar like you. 😊

[@RevelingDragon]

@@musicismyfriend7919 Interesting I was thinking about the Erudite race in EverQuest recently..

[@johnshaw6702]

​@@RevelingDragonStudents need practice working it out on paper, because things get much harder at higher math levels. The instructor also needs to know you weren't cheating. In my opinion, on a test like this, all you should have to do is give the correct answer, but that's me.

[@RevelingDragon]

@@johnshaw6702 Do you expect a calculator to show it's work? To show proof is disrespectful.

[@warrenjohn]

Got the answer right away but I forgot my factorials!☹

[@MartisGTR]

What about writing problems in a more clear way: 5[4+(40/2)] So you gotta ask yourself: is my goal to confuse people? Or to promote maths? 🤷‍♂️

[@petersearls4443]

You gotta ask yourself, why you don’t see this is a learning opportunity to figure out how to modify it like you just did.

[@MartisGTR]

@ I see your point but this ain’t such opportunity. I’m just used to properly written maths. When you are solving bigger problems you got no time to loose figuring out the order. It’s nonsense!

[@drjack5957]

Abominable seven or so minutes for the most straightforward math answer!😅

[@MrHotlipsholohan]

120 same as 5 factorial , b

[@todradmaker4297]

What purpose does a factorial serve?

[@MrHotlipsholohan]

@todradmaker4297 it is common to use Factorial functions to calculate combinations and permutations. Thanks to the Factorial you can also calculate probabilities.

[@MrHotlipsholohan]

@todradmaker4297 Factorials can be simple to compute and have many practical applications in the real world. For example, some companies use factorials to look at permutations and combinations for business purposes, like determining the number of trucks needed to supply their stores in each district.

[@lilianaprina5991]

Thanks is good...

[@bentenss2991]

B 120

[@DavidBrown-in8hi]

No….I thought it was 40, you’d have to get rid of the parenthesis first, then work the problem multiplication

[@AnthonyMichaels-g9s]

Dude...why didn't you make 120 one of the options? Youve made this explanation 100x more complicated than it needed to be.. This has to be modern common core math because I had the answer within 10 seconds. Ive been out of elementary school for 44 years and we used PEMDAS way back when.

[@ralfschirrmacher3163]

For the elder ones here in Europe this matters as they mostly do not have problems to solve it. For the younger generations it doesn’t matter as the majority of their brains couldn’t make it anymore. In Australia it might be similiar but for the US I am not that sure…

[@dawnash3950]

Pemdas and bodmas are exactly the same, only different words. ❤