Addition and Subtraction Like Denominators

Choose the BEST answer! (Simplify!)

3/9 + 4/9 = ?

• 7/18

• 7/9

• 12/9

• 12/81

Choose the BEST answer! (Simplify!)

15/20 + 3/20 = ?

• 18/20

• 45/20

• 10/20

• 9/10

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

• Add the numerators (top parts of the fractions).

• Rewrite the fractions in the simplest form. 

• Rewrite the fractions with a common denominator. 

• Make each fraction into an improper faction. 

What is the the next step to finding this answer?

• Add the numerators (1+1=2)

• Multiply both numerators by 12 .

• Multiply the first numerator by 4 and the second numerator by 3.

• Multiply the first numerator by 3 and the second numerator by 4.

Solve

• 11 3/4

• 11 3/8

• 11

• 3/4

The denominator of fraction above is ... .

• 2

• 3

• 5

Which equation represents the model shown?

Which equation represents the model show?