Lowest Common Denominator with Rational Expressions

What is the least common denominator of 1/9 and 2/3?

• 6
• 3
• 9
• 21

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32
• 12
• 8
• 24

Find the lowest common denominator of these fractions: 2/7 and 2/21

• 7

• 21

• 18

• 147

Find the least common denominator of 1/5 and 2/10.

• 10

• 5

• 50

• 15

Find the least common denominator of 1/6 and 5/12.

• 18

• 12

• 6

• 1

Find the least common denominator of 3/4 and 3/8.

• 3

• 4

• 8

• 12

Which of these numbers could NOT be a common denominator for 1/6 and 5/18?

• 6

• 18

• 36

• 108

Complete the equivalent fraction.

• 6
• 9
• 15
• 23

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What do you need to have when adding unlike fractions?

• common denominator
• common numerator
• common numerator and denominator

Tags

CCSS.7.NS.A.1C

Which of the following is an equivalent fraction to 5/6?

• 9/12
• 10/12
• 8/12
• 14/18

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1