GCF & LCM

What is the LMC ( 20 , 21 )

• 100

• 201

• 420

• 560

What is the LCM of ( 2 , 3 )

• 2

• 3

• 5

• 6

What is the LCM ( 3 , 6 )

• 3

• 6

• 9

• 18

Which of the following are methods of finding the LCM of a pair of numbers.

• We can prime factor the pairs of numbers and look for the smallest factor

• We can prime factor the pairs and multiply the non-repeating factors of one of the numbers to the factors of the other

• We can list out the prime factors of both numbers and multiply all the factors together

• We can list out the multiples of both numbers until we see one of the multiples match the other.

What is the GCF ( 21 , 16 )

• 1

• 3

• 4

• 7

What is the GCF ( 13 , 23 )

• 1

• 13

• 23

• 299

When will the GCF of a pair of numbers be equal to 1?

Select all that apply:

• when none of the numbers in the pair are prime

• When one of the numbers in the pair are prime

• When both numbers in the pair are prime

• When both pairs do not have any common factors

Tags

CCSS.4.OA.B.4

What is the LCM ( 14 , 21 )

• 14

• 21

• 42

• 294

What is the GCF ( 20 , 100 )

• 2

• 10

• 20

• 100

What is the LCM ( 7 , 5 )

• 5

• 7

• 15

• 35