Word Stuff
Fix my Mistake
Solve
Solve
Prime & Composite
100
Give the correct order of operations.
Parentheses, Exponents, Multiplication OR Division, Addition OR Subtraction
100

9 - 3 x 2=12

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

100
3 + 4 x 5
23
100

14 - 2 x 7

0

100

What are Prime numbers? 

Prime Numbers has exactly two factors. 1 and the number itself.

200

Why is it important to know PEMDAS as a mathematician?

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

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

Which group of numbers includes only prime numbers? 

A. 45, 55, 65, 76

B. 31, 37, 61, 81

C 29, 33, 73, 89

D 23, 41, 53, 59

D is the correct answer

300

What is the saying we use to remember the correct Order of Operations?

Please Excuse My Dear Aunt Sally.

300

3 - 6 = 0

3 = 9, not 6. Correct answer is 3

300
56 ÷ (4+4) + 32
16
300
5 + 14 ÷ 2 × 5
40
300

What number is NOT a prime number?

A 17

B 13

C 101

D 51 

D. 51 

400

Tell what 5 3 really means.

It means 5 x 5 x 5

400

4 + 5 + 7 - 3 x 2 = 26

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

400
20 – (5+3) x 2 + 4
8
400
(4-1)2 + (5+ 1)2
45
400

which set of numbers has one prime and one composite number 

A 10 & 80

B 2 & 5

C. 20 & 17 

C is the correct answer 

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

10 = 30

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

500
(5 x 4) – 6 ÷ 2 + 9
26
500
12 + 22 x 32 - 42
21
500

Define Factors and composite numbers 

answer varies on teacher 
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