12 divided by 8 all over 2 times 4 = ? Many will get this Basic Math problem WRONG!

[@billmorris2613]

In my head in a few seconds. 12 divided by 8 = 1.5 over 2 X 4 = 8. So 1.5 over 8 is not one of the answers. But 3 over 16 is = to 1.5 over 8. In a calculator both answers = 0.1875

[@rbpeirce]

I doubled them. 1.5/8 = 3/16.

[@happyhapley]

Was really expertly broken down to explain the principles. I learned how the division sign can be used to separate in brackets. Another way could be to use the inverse/flip principle (explained at 13:15 in the video) and just put the 8 to the bottom, so the denominator becomes 2 x 4 x 8, with 12 as the numerator. 12/64 is then 3/16.

[@tomtke7351]

the long fraction line acts like parentheses -- i.e. (12/8) ÷ (2×4) =(6/4) ÷ (8) = (3/2) ÷ (8) my recent finding is that it's less error prone to replace "÷y" with "×(1/y)" so = (3/2) ÷ (8) = (3/2) × (1/8) = 3/16

[@larbibenmrad1968]

(12/8) / 8 = (12/8) / (8/1) = (12 X 1) / ( 8 X 8) = 12/64 = 3/16 ( ps : (a/b) / ( c/d) = (a X d) / (b X c)

[@bobhenson1433]

One can quickly see that the answer has to be less than 1 and therefore there’s only one choice, 3/16.

[@chrisdissanayake6979]

Answer: 3/16 ------- 12 ➗ 8 ----- 2 x 4 3/2 -- 8 3 x 1 - -- 2 8 3 --- 16

[@Hewhowalks-fv5mq]

Mental maths could only have been 1 answer anyway.

[@enriqueiii9209]

Agree, Common sense

[@khadim-qg8bq]

Doesn't mental math need some rules ( PEMDAS/BODMAS ) to be followed?

[@enriqueiii9209]

@@khadim-qg8bq Not for this problem.

[@khadim-qg8bq]

@enriqueiii9209 but I request you to do mental math stepwise and those steps should follow some specific rule with their exception as well under certain conditions as in this problem.

[@enriqueiii9209]

@@khadim-qg8bq I did do Mental math in my head.

[@nicklaskristoferhansen382]

12/8 * 1/8 / 8/1 *1/8 = 12/64 / 1 = 3/16

[@KW-gb9cd]

(12/8)/(2 · 4) = (3/2)/8 = 3/16 = d.

[@panlomito]

12 / (8 . 2 . 4) = 3/16

[@williamarthur4801]

I've always found a good way is to just write x/y / a/b then multiply both sides by each denominator which in this case results in 12/64

[@Eris123451]

I'm astonished that I still remembered how to do this at 68, but I went straight there. Well done me.

[@cleokey]

1.5 divided 8 = 3/16

[@JackSturdivant-e4c]

d 3/16

[@Stylux-z1p]

[12 : 8] / [2 · 4] [12/8] / [8] dividing by a number is the same as multiplying by its reciprocal reciprocal of a --> 1/a , reciprocal of 3/4 --> 4/3 a : b = a · 1/b 12/8 · 1/8 = 12/64 = 3/16✅ -> d

[@adgf1x]

3/16...(d) ans

[@robertgiles1071]

(12/8)/(2*4)=0.1875=3/16

[@markdevries670]

(12/8)/(2*4) = (3/2)/8 = 3/16 Answer d. took me roughly 20 secs, answer at 13:20 You go figure it out how much time you need .... CHEERS🍺🍻

[@paulinerichardson2986]

25

[@narenmenon6906]

DO THE NUMERATOR AND DENOMINATOR SEPARATELY. ANSWER IS 3/16 ON SIMPLIFICATION. USING PARENTHESES.

[@narenmenon6906]

PARENTHESIS HELPS SEPARATE THE NUMERATOR FROM THE DENOMINATOR

[@billmclaurin6959]

d) 3/16

[@mossesmadjemite2289]

C) 12

[@raya.pawley3563]

3/16th? Thank you

[@JohnOvall-g3c]

3/16 d

[@michaelhembree2888]

Thank you for bringing back classical, common sense mathematic theory.

[@taecart8083]

.25/8=3

[@jeffreywhitmoyer860]

Got 3/16 doing it in my head, calculator said 3.

[@michaelmerta8956]

3/16 or 0.1875

[@chegewashingtonthiga]

D is my answer

[@AtomicHermit]

Or use an RPN calculator. 12 [Enter]8[÷]2[Enter]4[×][÷] Yielding 0.1875 or 3/16. Or manually: 12 ÷ 8 => 3/2 4 × 2 => 8 3/2 ÷ 8 => 3/2 × 1/8 => 3/16

[@cindygavette2599]

D

[@romanwondimu8696]

3

[@davecarter6298]

12

[@davecarter6298]

No a plus for me😢

[@vloveless6367]

Can we mind meld Mr Spock?

[@MikeBrzuchalski1956]

3/16

[@alastairgreen2077]

d

[@triggerfish999]

I did it in my head and came up with d) 3/16

[@tinpony9424]

Another prime example of the ambiguity of math. Mathmegaincians being stingy with chalk.

[@gavindeane3670]

You must be watching a different video. There's absolutely no ambiguity here.

[@flashtheoriginal]

12 div by 8 = 1.5 1.5 div by 8 = 0.1875, therefore the answer has to be a fraction. 0.1875 = 3/16

[@dulcinealee3933]

You can't get a whole number? so the only correct answer is d 3/16

[@russelllomando8460]

got 3/16 in my head 1.5 / 8 1.5 = 3/2 to divide by 8, multiply by 1/8 so 3/2 X 1/8 multiply accross = 3/16. thanks for the fun. afterward, i put 1.5 / 8 into a calc and got the decimal version of 3/16 as .1875. it does work.

[@enriqueiii9209]

I just saw the answers, 3/16

[@charleshart5158]

Get to the point without all the waffle

[@allenhilburn8686]

This was known as cross multiplying when I learned it. 😊

[@thomasandhelenodonnel9890]

Ah…thanks so much. This helps!

[@georgecattani7199]

= 12

[@ralphmelvin1046]

That's what I was thinking

[@javedahmed9801]

I solved it in 0.0000001 seconds

[@josephlaura7387]

d) 3/16

[@borisjeud8464]

D

[@usmiech1]

3/16

[@greglear50]

3/16

[@subasu478]

3/16

[@ferdie4236]

3/16

[@paulinerichardson2986]

3/16

[@ZafarKhan-pf1gg]

3/16

[@rodfulford4306]

3/16