Add and Subtract with Significant Figures (1.6)

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How to do addition and subtraction with significant figures, also known as significant digits.

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Jesus, he explains so well. I wish he was my teacher.

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Thank you for existing! You're like, way better than my Science teacher! ^_^

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Agreed!

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I agree, my science teacher takes a while to explane things, and by the end you have forgotten what the question was, or he explaines it weirdly

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+Kagamine Rin I agree.

[@diktugnutz]

Mine doesn't teach just makes us work out of the book!

[@jimmypatel1284]

Straight facts

[@tdewitt451]

@Kinin4 great question! sig figging is the in-depth, jedi-master rules for rounding that you use if you're doing math for science questions. it's kind of like the rules for dressing well: plenty of people can put together some clothes that look nice (that's like regular rounding). but then you meet someone who's all like, "oh, if you're wearing that sort of a shirt, you really have to wear this color tie, etc. etc." that's like the sig fig rules--the special master rules for rounding in science.

[@pcm8492]

14.859 should be rounded off to 14.8 since 8 is already even explain

[@BlurredUniverse357]

@@pcm8492 Thank you. I just was curious about that. I had to review.

[@captainjackson18]

@@pcm8492 ikr I was thinking the same thing

[@Herp234]

You should be proud you have the ability to simplify the material and allow others who don't understand, to understand it. As always this video was very helpful.

[@Gangsta0wns456]

Same here. I didn’t understand what to do with the problems with whole numbers and now i do.

[@tdewitt451]

@Cartier736 the rules for addition and subtraction are completely different from those for multiplication and division. i think you're confused because you're trying to take the rules you learned for multiplication and division and using them for this. the method i describe in this video is the standard way to use sig figs for addition and subtraction, so if it makes sense and you can do it yourself, you're all set.

[@babigril12]

Literally learned way more with him than I did with my teacher 🤭

[@nadinelucas7788]

Tyler, you are genius. The way you explain things makes me so excited as I understand chemistry from you better than any other chemistry site on you tube. I thank you so much as you clarified things that I have struggled to understand not only in significant figures but other chemistry lessons like redox reaction, polar and non-polar. you make my life much easier. Please don't give up!

[@tdewitt451]

Hey everyone, I'm here to help. If you have any questions or just want to learn more, click on the link in the description above. It'll take you to a page where you can ask me questions.

[@MisterJ34]

I've been watching this man since my freshman year of high school in 2016, now I'm in college this man still comes in clutch. Thanks for all your help

[@tdewitt451]

If they both have the same number of decimal places, then you don't have to worry about doing any rounding! Just keep the answer like it is.

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I LOVE YOU FOR MAKING THIS VIDEO!!! i got a new chem teacher and she doesn't explain anything.. thank god for KZbin!

[@pedroggg6388]

I just wanna let you know we’re still using this video 13 years later , and you explained it WAY better than any modern day teachers.

[@tdewitt451]

@roxxyroll3r yes, you keep both the 2 decimal places. don't worry about any numbers that are to the LEFT of the significant digits (those two zeros are to the LEFT of 5, which is the significant digit). you only worry about where the significant figure (the five) is, and that's in the second decimal place from the right. does that make sense?

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[@kat1798]

So incredibly thankful for your videos! You make understanding these concepts so truly simple. Plus, you have a very easy-going personality, which helps bolster my confidence.

[@pilot4910]

You made this 9 years ago and it’s still helpful

[@tdewitt451]

@alfonsopeterman only when you're doing addition and subtraction. the rules are different for multiplication and division, and i've got videos for those, too.

[@lizandrafernandes8707]

I really needed help with this because I didn't understand anything in class. Thank you so much for posting this video!!

[@sierravaillancourt2012]

This was remarkably helpful, thank you for making this so clear and concise!

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Dude...I think I just found my Chemistry help channel...

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John B Buddy, I feel you.

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[@applesryummification]

You are a life saver! I have watched all of your sig. fig. videos and in 15 min. I get it better than 6 hours of my chem. class! Thanks!

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THis is so awesome! I am a novice to Chemistry, but you have taught me well in a few minutes. I thank God for people like you who makes learning so intriging.

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Yes

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[@carlyjohnston9564]

he explained it 10x better than my teacher w/ a phd for this stuff, he made it so easy to understand

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This is fantastic! You make Chemistry so much easier to learn. I truly value the help. Thank you!

[@sarah-janecox7816]

You explained this waaaayyy better than my scienc teacher! Thank you! It's so simple now!

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A 5 min video explained better than my teacher did in a week, THANK you so much for this

[@v897796]

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[@kevinwiener8512]

Thank you, thank you, thank you! That's 3 significant thank yous. Your videos on significant figures helped my daughter greatly and helped me to help her.

[@tdewitt451]

@roxxyroll3r i'm not adding 8+5, i'm adding 8.679+0.3+5.88, so of course i get more than 13, i get 14.859. just type those three numbers into your calculator and that's the answer you'll get, you won't get 13. then you take that answer (14.859) and round it to one decimal point, so you get 14.9. if you have questions about significant zeros, watch my videos on those topics.

[@MF-di7dp]

Undoubtedly all your videos are always easy to understand. You're such a good teacher!

[@ell3ngl3n]

So glad I found this! Thank you for quickly and efficiently making significant figure problems understandable :)

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Thank you soooo much I wasn't quite sure how to do these but the way you explained really helped

[@whatthehec6736]

Thanks so much. This really helped me. Thank you for all that you do, especially for free! I feel so confident with all of this now.

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Thank you for explaining it very clearly. I got this now. I have been trying to figure this out for an hour and I couldn't. Your five minutes video made me very clear.

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You've literally saved my grade I come to this channel for every unit thank youuuu

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THANKSSS SO MUCHHH! I DID'NT LISTEN TO MY TEACHER😂 REGRET IT

[@SharpManFC]

Thanks for the explanation. You make it sound easy. I'm doing college math and this was part of the curriculum. Much appreciated!

[@tdewitt451]

Round to the thousanths. Those zeros in .100 count, because they come to the right of a decimal point. Watch my videos on significant zeros if a need a brush up on when a zero is significant and when it's not.

[@drewpadilla8724]

Dude u helped me in 10 minutes through these videos than any of my professors had in months ! Thank you

[@TonyandDylan]

I have watched all your videos on sig figs and I have now mastered what seemed to me like rocket science before. Much thanks ,Dylan F.

[@Gabriellaxyz]

Thank you Tyler! I'm using your videos to learn this stuff in Gen Chem in college. I forgot everything I knew about sig figs in high school. When we went through them in class today my Prof blew threw them and I was left confused. Then I found your videos. Now I can do them. Thank you! Take care!

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Tyler is an excellent instructor.Makes problem user friendly and he has excellent public speaking skill.

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This was incredibly helpful! Thank you so muchYou explained it ten times better than my Chem teacher did

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you're so much better than my Chem teacher thank you for these vids

[@Gangularis]

Your videos have been super helpful. Wasn't really getting this the way my professor was teaching it.

[@xavierpacheco1712]

Thank you so much Tyler. You helped me get a better grade on my chem test and understand sig figs better.

[@Aeronite123]

YOU ARE AWESOME....I watched all your gas laws lesson and now im feeling confident about my exam tomorrow!!!! THANK YOU!!!

[@TbirdEnergy]

Cleared things up for me very much. Thank you

[@tdewitt451]

@nosaj2011 yeah, some textbooks have that rule. find out if your teacher wants you to do that, and if they do, you should do it that way. the reason i don't teach that is because it's wrong, pure and simple. that method of rounding is known as the "banker's rule," and is used for accounting, you know, like calculating money in bank accounts, NOT for doing science. i have no idea when and why people started using it for scientific calculations, but there's no reason to use it for science.

[@teasky1031]

Thank you Tyler, I have watched a numbers of different video on this topic and your is easiest to understand. I am good on this topic now.

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Thank you! we stumbled upon this lesson in our science and math subjects, you made me understand the whole concept!

[@Hamisht12]

This is a far easier and better way of understanding what's being asked than what my course notes say!

[@mei1217ka]

OMG you explain wayyy better than my chem teacher!!! Thank you so much!!

[@Soccerstar988]

Wow, thank you so much! I have a Chemistry quiz tomorrow, and my teacher isn't the best at being clear. This completely helped me, and I understand!

[@MRvideoCONVERTER]

Life saver watched all your videos on sig figs from 1.1 to 1.6 all of which were wonderfully explained, thanks again

[@antoniomelike]

thank you so much, i cant even begin to explain how much these videos helped me out with sig figs, i really appreciate the posts!!

[@jvyl2007]

This made understanding soo much easier! My chem teacher didn't do a great job explaining, but now I totally get it!

[@tdewitt451]

@gabrielaw429 you can't add or subtract two units with different units, so you have to convert. however, you can't make meters (m) and square meters (m^2) match, because they measure different things: meters measures length and square meters measures area. so honestly, there is no correct way to do that problem. however, it's totally fine to multiply or divide numbers with different units.

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yes- thank you so much. I've got a professor who (i can swear) only speaks Chinese (or at least it sounds like it) and I was getting SO frustrated in class earlier. At 27, i was embarrassed to keep asking questions, so these videos have been a great help. THANKS!!

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In the two years that my teacher has been trying to teach this to us, only you finally made sense to me!

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OMG THIS MAKES MORE SENSE ... I HAVE AN F FOR THIS TOPIC AND NOW I THINK IM GONNA ACE ON THE EXAM LIKE A PRO.. THANK YOU.

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Your videos helped a bunch! Thanks Tyler DeWitt!

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So easy ....I was reading a chemistry book for hours and couldn't get it but now I get it ...helpful videos thanks.

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Thank you Tyler DeWitt for taking the time to make tutorial videos for those of us that dearly need your help. You saved me from failure :o) and i just subscribed you!

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So I did this all last year and didn't understand it. Then I went over it as review today still not understanding. Yet watching 1 minute of this video I got it perfect. Thank you so much!

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Hey man thanks for the help, was really struggling with the significant figures. You just made them click with me.

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fantastic video. really helpful and the problems you did were very helpful too.

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You taught me more in 4 minutes than my teacher has in 50. THANK YOU

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Thanks for clearing this up! My science teacher barely even looked at this subject, so I had to look up how to exactly use it since I was getting points knocked off. _Thanks Science teacher._ You explained it a lot better though, thanks!

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This help me so much with going into class with knowing nothing about significant figures.

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This video was awesome, my science teacher was talking about the place value e.g tenth, hundredth... I didn't have a clue.. I now know how to add and subtract! Thank you!

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Although this video was made 10 years ago. It helped me today 2021. Thankyou

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this guy explained the whole the problem clearly in 4 minutes whereas my teacher spends 20-30 minutes trying to explain whatever he was trying to say

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I was utterly confused by my homework on significant figures; I thought I would never understand how to add or subtract them and the rules were too complicated. What i failed to learn was explained to me in 2 and a half minutes. Thank you for this 😊

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THANKYOU YOU JUST CHANGED MY LIFE!