Finding GCF and LCM

What is the GCF of 12 and 18?

• 3

• 4

• 6

• 9

What is the GCF of 36, 54, and 90?

• 6

• 10

• 15

• 18

Which set of numbers are relatively prime?

• 6, 8, and 10

• 4, 8, and 9

• 3, 6, and 15

• 7, 14, and 21

What is the LCM of 15 and 20?

• 45

• 60

• 75

• 100

What is the LCM of 6, 9, and 12?

• 3

• 18

• 24

• 36

Which of the following statements is correct?

• 8 is a factor of 96.

• 7 is divisible by 49.

• 9 is a multiple of 27.

• 0 is a factor of any number.

What is the largest number that can divide 20, 28, and 44?

• 2

• 4

• 6

• 8

What is the smallest number that can be divided by 18 and 27?

• 9

• 36

• 54

• 72

In using continuous division to find the GCF of the given numbers, we stop dividing when ________.

• the dividends are all 1

• the dividends are all composite numbers

• the dividends are all odd numbers

• the dividends are relatively prime

Jericho divided a number by 7. After dividing, he found out that there is no remainder. What can he conclude?

• The number is a factor of 7.

• 7 is divisible by the number.

• The number is a multiple of 7.

• The given number and 7 are relatively prime.