Fractions Adding and Subtracting with Models

The shaded part of the model represents a fraction. Another fraction was subtracted from the first fraction. Which expression does the model represent?

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

When adding or subtracting fractions, I always add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

What is the best common denominator for this problem?

• 5

• 2

• 20

• 10

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20

2/5 + 3/10

• 7/10

• 5/10

• 1/2

• 5/15

Marty made two types of cookies.  He used 2/3 cup of sugar for one recipe and 1/4 cup  of sugar for the other.  How much sugar did he use in all? 

• 5/12

• 3/7

• 11/12

• 1/3