Adding and Subtracting Fractions with Unlike Denominators

Can we add these fractions together yet?

• No, they have unlike denominators

• Yes, I can add these

What is the least common multiple of 3 and 2? (What is the least number 3 and 2 both multiply to make?)

• 6

• 1

• 5

• 12

Why did I multiply each fraction by a number?

• To get common denominators

• To simplify the fractions

• To change a mixed number to an improper fraction

• To change a fraction to a decimal

How do you get common denominators in this problem?

• Multiply 7 and 8 by 2

• Subtract 4 from 7 and 8

• There is no way to get common denominators

• Multiply 3 and 4 by 2

Find the error

• No error, the answer looks correct

• The denominators should be the same

• The answer should be negative since 15-16= -1

• The numerators should be added

Simplify this fraction

• 12/16

• -5/7

• 1/2

• 3/4

Convert the mixed number to improper fraction

• 7/4

• 15/4

• 4/3

• pizza

Add

• 7/6

• -3/2

• 4/5

• 3/5

Subtract

• 1/2

• 9/4

• 15/8

• 3/2

Solve

• -11/5

• 3/5

• -3/5

• 11/5