Adding and Subtracting Fractions with Unlike Denominators

Why do we need a common denominator when adding fractions?

• To make the numerators the same

• To ensure the fractions have the same value

• To make the fractions easier to read

• To be able to add the fractions directly

Tags

CCSS.4.NF.A.2

CCSS.4.NF.C.5

What is the least common multiple (LCM) of 9 and 3?

• 9

• 18

• 3

• 27

Tags

CCSS.4.OA.B.4

What is the equivalent fraction of 1/3 with a denominator of 9?

• 4/9

• 3/9

• 2/9

• 1/9

Tags

CCSS.4.NF.A.2

CCSS.4.NF.A.1

What is the sum of 4/9 and 1/3?

• 5/9

• 6/9

• 7/9

• 8/9

Tags

CCSS.4.NF.B.3

What is the least common multiple (LCM) of 10 and 6?

• 40

• 50

• 20

• 30

Tags

CCSS.4.OA.B.4

What is the equivalent fraction of 3/10 with a denominator of 30?

• 6/30

• 9/30

• 12/30

• 15/30

Tags

CCSS.4.NF.A.2

CCSS.4.NF.A.1

What is the sum of 3/10 and 2/6?

• 15/30

• 17/30

• 19/30

• 21/30

Tags

CCSS.4.NF.C.5

What is the least common multiple (LCM) of 6 and 12?

• 6

• 24

• 12

• 18

Tags

CCSS.4.OA.B.4

What is the difference between 5/6 and 3/12?

• 2/6

• 1/6

• 4/6

• 3/6

Tags

CCSS.4.NF.A.2

What is the simplified form of 8/20?

• 3/5

• 1/5

• 2/5

• 4/5

Tags

CCSS.4.NF.A.2

CCSS.4.NF.A.1