GCF and LCM

Find the GCF of 64 and 144.
Hint-Remember to use your factor trees to help you.

• 8
• 6
• 16
• 2

GCF of 27 and 70

• 3
• 5
• 7
• 10

Which pair of numbers has a GCF of 5?

• 10 and 25
• 30 and 40
• 45 and 9
• 50 and 25

Prime numbers have:

• Exactly 2 factors
• 2 pairs of factors
• More than 2 factors
• 1 factor

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors

What is the least common multiple (LCM) of 4 and 10?

• 4
• 40
• 15
• 20

What is the LCM of 2, 4, 6?

• 6
• 12
• 4
• 2

What is the least common multiple (LCM) of 4 and 10?

• 4
• 40
• 15
• 20

There are 14 girls and 21 boys in Mr. Kirsh' virtual class. To play a certain game, the students must form teams. Each team must have the same number of boys and girls. What is the greatest number of teams Mr. Kirsh can make if every student is on a team?

• 7 teams

• 14 teams

• 21 teams

• 42 teams

Nathan has 12 jars of grape jam, 16 jars of strawberry jam, and 24 jars of raspberry jam. he wants to place the jam into the greatest number of boxes possible so that each box has the same number of jars of each kind of jam. How many boxes does he need?

• 4 boxes

• 3 boxes

• 6 boxes

• 12 boxes