Greatest Common Factor (GCF) & Least Common Multiple (LCM)

The Greatest Common Factor (GCF) of a set of whole numbers is the largest positive integer that divides evenly into all numbers with a zero remainder.

• True

• False

The prime factorization of 50 is:

(a)  

(a)   is simply the smallest common multiple between two or more numbers.

The factors that 45 and 60 have in common are:

• 1, 2, 5, 15

• 1, 3, 9, 15

• 1, 3, 5, 15

• 1, 5, 6, 15

The Greatest Common Factor (GCF) of 45 and 60 is:

• 9

• 5

• 10

• 15

List the following multiples: _____, 16, 24, ____, 40, ____

(a)  

What is the Least Common Multiple of 4 and 15?

(a)  

What is the Prime Factorization of 150?

• 5 x 2 x 3 x 5

• 2 x 3 x 5 x 5

• 3 x 2 x 5 x 5

• 5 x 3 x 2 x 5

What is the Least Common Multiple (LCM) of 14 and 21?

(a)  

At the gym, Anferny swims every 6 days, runs every 4 days, and cycles every 16 days. If he started all three activities today, what is the least amount of days he will do all three activities again on the same day?

(a)