Math Review

Prime/Composite

100

This number is prime:
A. 20
B. 15
C. 10
D. 5

5

200

This number is composite:
A. 4
B. 5
C. 11
D. 17

4

300

The answer to the following is a prime number.
A. 3 x 4
B. 15 -5
C. 2 x 2
D. 9 divided by 3

9 divided by 3

400

The answer to the following is a composite number.
A. 3 x 1
B. 2 x 0
C. 7 + 4
D. 8 + 16

8 + 16

500

This is how you write 36 as the product of its prime factors.
A. 6 x 6
B. 3 x 12
C. 2 x 2 x 3 x 3
D. 4 x 9

2 x 2 x 3 x 3

LCM

100

What is the lowest common multiple of the following numbers?  5 and 8

a)  20
b)  5
c) 40
d) 30

LCM= 40

200

What is the lowest common multiple of the following numbers?  3 and 7

a)  21
b)  12
c)  3
d)  9

LCM = 21

300

What is the lowest common multiple of the following numbers?  12 and 18

a)  6
b)  8
c)  36
d)  14

36

400

Determine the LCM between each group of numbers 7 and 9.

a) 21
b) 53
c) 18
d) 63

63

500

Determine the LCM between each group of numbers 4, 6 and 9

a) 3
b) 12
c) 36
d) 23

36

GCF

100

What is the greatest common factor of 20 and 8?
a) 2
b) 12
c) 4
d) 10

GCF=4

200

What is the greatest common factor for 12 and 56?

a) 24
b) 32
c) 6
d) 4

GCF = 4

300

What is the greatest common factor of 32 and 64?
a) 22
b) 28
c) 48
d) 32

GCF = 32

400

What is the greatest common factor of 64 and 240?

a) 16
b) 18
c) 28
d) 46

GCF = 16

500

What is the greatest common factor for 60, 120 and 90?

a) 9
b) 60
c) 30
d) 3

GCF= 30