PEMDAS (Order of Operations)

Word Stuff

100

Give the correct order of operations.

Parentheses, Exponents, Multiplication OR Division, Addition OR Subtraction

200

Why is it important to know PEMDAS as a mathematician?

So everyone can solve every problem the same (correct) way.

300

In what order do we do multiplication and division?

Left to right

400

In what order do you do addition and subtraction?

Left to right

500

The problem was 20 - 5 x 2 + 3. My answer was 33. What did I do wrong?

I went from left to right without using the correct order of operations.

Fix my Mistake

100

9 - 3 x 2=12

Correct answer is 3. Do x then -, not - then x.

200

4 x 3 - 1 = 8

4 x 3 - 1 = 11 not 8, multiplication happens first

300

12 - (4 + 1) = 9

12 - (4 + 1) = 7 not 9, parentheses come first

400

4 + 5 + 7 - 3 x 2 = 26

You need to follow PEMDAS and do x first. Correct answer is 10.

500

10 - 4 x 2 + 7  = 19

10 - 4 x 2 + 7  = 9 not 19, multiplication is done first, then work left to right

Solve

100

3 + 4 x 5

23

200

7 + (2 x 4) - 1

14

300

56 ÷ (4+4) + 3

10

400

20 – (5+3) x 2 + 4

8

500

(5 x 4) – 6 ÷ 2 + 9

26