Adding Fractions with Unlike Denominator

Danny added the following fractions incorrectly. What was the first step that Danny needed to take to add the following fractions?

• Danny needed to find the Least Common Multiple to find a common denominator of the fractions before adding.

• Danny left his answer as an improper fractions

• Danny did the wrong operation, he did not add.

• Danny did not make a mistake.

Answer explanation

Remember,

Step 1: Find the Least Common Multiple to find a common denominator

Tags

CCSS.7.NS.A.1C

What do you need to have when adding unlike fractions

• common denominator

• common numerator

• common numerator and denominator

• common fractions

Tags

CCSS.7.NS.A.1C

What math equation is being represented in the picture?

Tags

CCSS.4.NF.B.3A

What is the least common denominator for these fractions?

• 48

• 56

• 16

• 24

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20

Tags

CCSS.7.NS.A.1C

• 3

• 14

• 21

• 147

What is a good common denominator for this problem?

• 18

• 9

• 24

• 12

What is a good common denominator for this problem?

• 24

• 18

• 32

• 16

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D