Adding and Subtracting Fractions and Mixed Numbers with Models

Cara and Marcus shared a candy bar. The models are shared to show the fraction of the candy bar each of them ate. What fraction of the candy bar did Cara and Marcus eat altogether?

Mrs. Ali collected notebook paper from her students at the beginning of the school year. The model is shaded to show the fraction of this notebook paper that Mrs. Ali used in each of the three months. What fraction of the notebook paper Mrs. Ali collected was used during these three months?

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

Add these two fraction models together. What is their sum?

• 1 6/10

• 1 6/100

• 9/100

• 6/10

• A

• B

• C

• D

Simply the following fraction model.

Answer explanation

The shaded area is the top number (numerator). The total boxes in one shape is the bottom number (denominator). If the numerator and denominator are the same then the answer is 1.

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

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