Rounding and Order of Operations Used in Significant Figures

We'll cover all the significant figure rules, how to round sig figs, and how to solve chemistry questions that mix math operations together. This is a great review of order of operations (PEMDAS) and how math is used in Chemistry.
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Dear Melissa - As a current college student with ADHD, It was extremely difficult to grasp Chemistry at such a fast pace. I failed, having to retake the course again, and fell into a very bad headspace. But when I discovered your videos, I could finally understand each concept.. all for free! (This is too good to be true)! I can't thank you enough. Your videos motivate me during the most challenging times, and I am finally excited to learn again. Thank you so much, from the bottom of my heart. Never stop teaching! Thank you, always ♥!

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[@melissamaribel]

You are so welcome!

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sooooo easy to understand, was having trouble in class to do sig figs, but now I am really understanding it! Thanks so much!

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[@sunchan4339]

Hi there, how do we determine the sig fig of uncertainty, standard devaition , relative standard deviation and standard error in analytical chemistry? thank you very much

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[@peves-]

In actual order of operations it doesn't matter if you do Multiplication first or division first, You should still come to the same answer. This also applies to Addition and subtraction. which is why some people say BEDMAS, while others say PEMDAS. It's the same result. You can flip the order around and still get the same outcome, but this only applies to MD or DM being in the middle and AS or SA being last. What I'm trying to say about the MD and AS is that those don't have to go from left to right although we are very consistently reminded in this video that it must go left to right when really it doesn't. it's Brackets, Exponents, M or D (If M was chosen you do D next and vise versa), A or S (If A was chosen you do S next and vise versa).

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I love your teachings.but I have small problems

[@AG-kn9gn]

I've heard that in chemistry if the digit to the right of the last number you want to keep is a five you are supposed to round up if it's odd and leave it alone if it's even. For example, if I was told to round 2.5 to 1 sig fig, it would be 2, not 3 because 2 is even. Is that true?

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Thank you so much! I've been having trouble with Sig figs for a while and this is super helpful! (^0^)

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Where is the answer key for this checklist and practice problems?

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Thank u Ma’am but can u answer my question that is find 4 s.f of 160.37

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How many significant figures has this number: 0.0625?

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[@AmberU]

Oh geez why is the 8.02 2 decimal places and not 1 ?

[@123Neldog]

I don't comprehend how you got 0.159 for question 5 d)... I got 0.1591530318... could you show me the working or at least explain how we are spose to know when stop or start rounding up or down?

[@123Neldog]

never mind! found the rule 😅

[@clboymom9467]

Are these Sig Fig rules just something you memorize? They don’t seem logical to me.

[@melissamaribel]

Unfortunately yes these are rules you memorize.

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OK like I love you

[@jbons4693]

So pemdas works in every situation except every situation? Great lol.

[@amukelanisiwela1358]

No wonder I've been getting it all wrong....