Subtracting Fractions with Unlike Denominators Explained

Why is it necessary to find a common denominator when subtracting fractions?

• To make the numerators equal

• To simplify the fractions

• To ensure the fractions have the same base for subtraction

• To convert fractions to decimals

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

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

• 24

• 18

• 12

• 6

How do you rename the fraction 5/6 with a denominator of 12?

• 20/12

• 15/12

• 10/12

• 5/12

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 10/12 and 3/12?

• 7/12

• 13/12

• 3/12

• 1/12

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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

• 30

• 20

• 10

• 40

How do you rename the fraction 9/10 with a denominator of 20?

• 9/20

• 27/20

• 36/20

• 18/20

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the renamed fraction of 2/4 with a denominator of 20?

• 2/20

• 10/20

• 8/20

• 4/20

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 18/20 and 10/20?

• 8/20

• 10/20

• 28/20

• 18/20

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the greatest common factor (GCF) of 8 and 20?

• 10

• 4

• 2

• 8

What is the simplified form of 8/20?

• 4/10

• 2/5

• 1/4

• 3/5