Highest Common Factors and Least Common Multiple

Which one of the following numbers is a prime number?

• 0

• 1

• 2

• 4

Which one of the following numbers is NOT a prime number?

• 53

• 57

• 59

• 61

What is the HCF of 15 and 50?

• 3

• 10

• 5

• 2

what is the LCM of 12 and 18?

• 34

• 36

• 20

• 25

A factor is a number that can divide into another number with no remainder

• True

• False

LCM

• Greatest Common Factor
• Common Denominator
• Least Common Multiple
• Greatest Common Multiple

Adam is trying to find the greatest number of gift bags he can give to his friends. He wants the same amount of toy dinosaurs and stickers in each bag. If he has 30 toy dinosaurs and 20 stickers, what does he need to find? How many dinosaurs and stickers will be in each bag?

• Greatest Common Multiple; 3 dinosaurs and 2 stickers

• Greatest Common Factor; 3 dinosaurs and 2 stickers

• Greatest Common Factor; 6 dinosaurs and 4 stickers

• Least Common Multiple; 60 dinosaurs and 60 stickers

Composite numbers:

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

Using a Factor Tree, find the prime factorization of 150.

• 2³ x 3 x 5

• 2 x 5²

• 2 x 3 x 5²

• 5² x 6