GCF/LCM Review

GCF/LCM Review

​

GCF

• greatest common factor

• use prime factorization tree

• find the factors in common and multiply

LCM

• Least Common Multiple

• list the multiples of both numbers

• skip count or times table chart

• find the LOWEST the numbers have in common

Multiple Choice

Using the prime factorization tree is for which one?

• GCF

• LCM

• division

Multiple Choice

After listing the multiple of two numbers you can find the

• GCF

• LCM

• quotient

• product

Poll

Which do you think is easier to solve for?

• LCM

• GCF

Multiple Choice

What is the prime factorization of 28?

• 4 x 7

• 2 x 2 x 7

• 2 x 14

• 1 x 28

Multiple Select

Which 2 of the following are prime numbers?

• 12

• 7

• 11

• 20

Multiple Choice

Choose a prime number from the list.

• 7

• 8

• 9

• 10

Multiple Choice

Is 35 prime or composite?

• prime
• composite

Multiple Choice

Find the GCF of 12 and 30

• 12

• 2

• 5

• 6

Multiple Choice

Find the Least Common Multiple (LCM) of 4 and 6.

• 4

• 6

• 12

• 24

Multiple Choice

Is 5 prime or composite? 

• Prime
• Composite

Multiple Choice

Find the Greatest Common Factor (GCF) of 8 and 10.

• 2

• 4

• 10

• 18

Multiple Choice

Pencils come in packs of 8 and highlighters in packs of 12.

What is the least number of pencils and highlighters you need to buy for an equal amount?

• 4

• 48

• 24

Multiple Choice

Which number is the LCM of 3 and 5?

• 3
• 5
• 8
• 15

Multiple Choice

What is the GCF of 18 and 42

• 1
• 6
• 9
• 18

Multiple Choice

Which is not a factor of 30?

• 1
• 2
• 4
• 5

Multiple Choice

What is the least common multiple of 6 and 9?

• 54

• 36

• 18

• 12

Multiple Choice

What is the GCF of 12 and 30?

• 2

• 30

• 60

• 6

Fill in the Blank

What is the greatest common factor of 14 and 49?

Multiple Choice

Kim goes running every 4 days and swims every 10 days. If she did both today how many days before she does both again?

• 2

• 40

• 20

• 4

Multiple Choice

What is the GCF of 12 and 10?

• 1
• 2
• 60
• 120