Explain It
Solve It 1
Fix It
Solve It 2
100
Give the correct order of operations.
Parentheses, Exponents, Multiplication OR Division, Addition OR Subtraction
100
3 + 4 x 5
23
100

9 - 3 x 2=12

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

100

14 - 2 x 7

0

200

Why is it important to know PEMDAS as a mathematician?

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

200
7 + (2 x 4) - 1
14
200
5 2 + 1=11
5 2 = 25, not 10. Correct Answer is 26.
200
49 ÷ (3+4) + 52
32
300

True or False: you should always multiply before you divide and always add before you subtract

False: multiplication and division are performed from left to right; so are addition and subtraction.

300
56 ÷ (4+4) + 32
16
300

3 x 4 + 5 = 27

3 x 4 should be solved first to get 12, then add 5 to get 17.

300
5 + 14 ÷ 2 × 5
40
400

Explain what 5 3  means.

It means 5 x 5 x 5

400
20 – (5+3) x 2 + 4
8
400

4 + 5 + 7 - 3 x 2 = 26

Multiplication should be done before adding and subtracting. The correct answer is 10.

400
(4-1)2 + (5+ 1)2
45
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.

500
(5 x 4) – 6 ÷ 2 + 9
26
500

10 3  = 30

10 3  = 10 x 10 x10, which is 1000, not 30.

500
12 + 22 x 32 - 42
21
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