Adding and Subtracting Fractions and Mixed Numbers with Unlike Denominators

Aden is helping his dad paint his house. They mixed 5/9 gallons of white paint and 1/6 gallons of blue paint. How many gallons was the mixture in all?

• 6/18 gallons

• 13/18 gallons

• 4/5 gallons

• 1/6 gallons

Stacy used 1/4 cup of sugar and 2/3 cup of flour to bake a cupcakes. How much more flour did Stacy use than sugar?

• 11/12 cup

• 10/12 cup

• 6/12 cup

• 5/12 cup

Jimmy filled a pitcher 1/2 of the way full with water. Carolyn filled a pitcher of the same size 5/6 of the way full with water. How much more water did Carolyn fill than Jimmy?

• 1/6 more water

• 2/3 more water

• 1/3 more water

• 3/6 more water

• 14/16
• 7/8
• 8/7
• 4/10

When I add or subtract fractions I must have _________ units.

• denominator

• numerator

• like

• unlike

To make like units, I can multiply the _________________ to find a common multiple.

• numerators

• denominators

• whole numbers

• mixed numbers

What like unit can I use for 1/10 and 1/3?

• 6

• 5

• 1

• 30

USE SCRATCH PAPER AND SOLVE THIS WORD PROBLEM: The classroom made cookies. They used 1 1/4 cups of white flour for the chocolate chip cookies. They used 2 1/3 cups of flour for peanut butter cookis. How much flour did they use in total?

• 3 2/7 cups

• 3 7/12 cups

• 1 1/12 cups

• 1 2/7 cups

USE SCRATCH PAPER AND SOLVE THIS MULTI-STEP PROBLEM: The 5th and 6th Grade Center served pizza on Tuesday. First Lunch Shift ate 2/5 of the pizzas. Second Lunch Shift ate 3/10 of the pizzas. How much pizza was remaining for Third Lunch Shift?

• 3/5

• 15/50

• 5/15

• 2/50

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20