Order of Operations (PEMDAS) – Let’s Learn Step by Step…

Learn the Order of Operations (PEMDAS) - "Please, Excuse, My, Dear, Aunt, Sally" which stands for Parenthesis, Exponents, Multiplication, Division, Addition and Subtraction.

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TC Math Notes

[allenu]

I remember doing this in 3rd and 4th grade back in the 70's . It's true what they say if you don't use it you lose it! My 13 year old son is doing the new math
and is way over my head. Awesome video!

[nasrullahhusnan]

May I ask a question about tower of exponent sir? For example a^b^c Using parenthesis to make it clearer, I mean it as a^(b^c) not a^bc. We do the exponentation from top to the bottom.

[grumpyolddude]

16 ius the right answer, but you did it in the wrong sequence. Exponents 1st, in the absence of paranthesis.

[davidduncan]

It makes me feel more confident about my math when I have a teacher who gives partial credit. I was asked to find the common height of two triangles with different bases in trigonometry class. I did not know how long the bases were, but I knew that one base was 40 meters longer than the other, so this could be expressed as X and X+40. The variable, H, represented the height. I had my system of equations, got the H alone to equal a sum of X multiples and plain units, combined, plugged in that combination for H, and solved the variable X. This was a six point problem on my trig exam and I was lucky that I had a teacher who would give me three points out of six for this one problem. What I did wrong was I have failed to answer the question. I have successfully solved the variable X, but X represented the base of the smaller triangle and the question was all about the height. At that point, I still needed to use one more tangent function as the still unknown height over the previously solved base, then multiply the tangent function times the base to get the height. Whether if you are in calculus, algebra, geometry, or pre-algebra, you will encounter similar situations like this, especially with word problems and if you are going to get a perfect score on your exams, you are going to take the extra steps necessary to answer the questions.

[danieljohn]

I still have problems multiplying, dividing and subtracting negative numbers. That is where am getting it wrong otherwise mt steps is very ok. Thanks for your relentless effort i learnt a lot from your videos,

[Ceedubbz]

Needed a little PEMDAS refresher before testing for marine bootcamp thanks man!

[okechukwuchinda]

Thank you so much dear Sir. But I found the first example really confusing, although that's expected in mathematics, especially since the order of operations were not followed exactly as intended. I see that in American educational system, PEMDAS is used as Order of Operations, and I find that quite interesting. However, from my Nigeria educational system, we use BODMAS. Brackets, Orders, Division, Multiplication, Addition and Subtraction. Hence, when I did the first example, I followed the BODMAS operations exactly and came out with the answer as 16. I am happy that I can have both operations at the back of my mind.
Thanks once again.

[dianaflores]

How I remember PEMDAS in school
P-Please
E-Excuse
M-My
D-Dear
A-Aunt
S-Sally
😄

[kristinawiley]

Thank you for the refresher, I will keep following

[richardlippincott]

I love these equations! Thanks, Doc!

[yvrosedouyon]

Thank you very your help is well appreciated 🙏

[brocksprogramming]

1 because it goes Power, Multiplication, then Division.❤🎉

[dt]

I teach to do the ‘square first’, to follow PEMDAS.

[cassben]

I still don’t see how -25 is + -7
How do we know to add here.
I thought you would multiply at first -25 x-7
Then I thought -25 subtract -7
How did that part become an addition problem?

[BasicTrish]

Thank you for the trick questions, your work is not in vain. I am studying to eventually become a PE

[kjellg]

And what about expressions with juxtapositoned variables? PE(MD)(AS) can led to incorrect results. In short: use brackets to make things clear!

[sawdust]

16 divided by 4 x 4= 4x 4= 16. I’m finally getting it!

[steveneldridge]

I say the answer is 1 : 4 * 2 squared/16= 1

[brucewmclaughlin]

Ok so most of these I get right but is there a practical reason for these equations aside from making some of us confused?

[leroydalton]

How about PEDMAS? I have seen both taught. Which is correct?