LCM and GCF

What is the least common multiple (LCM) of 8 and 5?

• 50
• 40
• 5
• 8

What is the least common multiple (LCM) of 15 and 2?

• 30
• 2
• 45
• 152

Fill in the missing multiple.
3:  3, 6, 9, ___, 15, 18, 21

• 10
• 11
• 12
• 13

Which list of numbers contains only common multiples of 4 and 8?

• 4, 8, 12, 16, 20
• 8, 16, 24, 32, 40
• 8, 16, 20, 24, 28
• 12, 16, 20, 24, 28

Which list of numbers contains only common multiples of 3 and 6?

• 6, 9, 12, 15, 18  
• 6, 12, 18, 21, 24
• 6, 12, 18, 24, 30
• 3, 6, 9, 12, 15

Joe has listed the first 4 multiples of 7 as: 
7   14    22     28
Which one is incorrect?

• 7
• 14
• 22
• 28

List all the factors of 18

• 1, 6, 9, 18
• 1, 2, 3, 4, 18
• 1, 2, 3, 6, 9, 18
• 2, 6, 9, 18

What is the GCF of 24 and 40?

• 1
• 2
• 4
• 8

Find the GCF of 12 and 6. 

• 1
• 6
• 2
• 3

Find the Greatest Common Factor (GCF) of 12 & 27

• 1
• 3
• 9
• 12