Adding and subtracting fractions with unlike denominators

Adding and subtracting fractions with unlike denominators

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by Sydney Prince

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Multiple Choice

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​2 ways to solve:

​1. Find common denominators and subtract. Look for the fraction model that represents your answer.

​2. Look fraction models that match your equation.

Multiple Choice

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​How to find common denominators...

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1. List the multiples of your denominators.

​2. Set up equivalent fractions.

​3. If your denominators change your numerators will also change by the same amount.

Multiple Choice

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• ​Simplification of the expression just means to solve the problem.

• ​Will your answer be greater than 1 or less than 1? Why?

Multiple Choice

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​Do you know the total?

​YES you know the total

• ​-Subtract to separate UNEQUALgroups.

• -​Divide to separate EQUAL groups.

​PROBLEM SOLVING STRATEGIES

​Do you know the total?

​NO you do NOT know the total:

• ​-Add to join UNEQUAL groups.

• ​-Multiply to join EQUAL groups.

Multiple Choice

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​USE THE FOLLOWING INFORMATION TO HELP YOU SOLVE THE NEXT QUESTION.

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1 WHOLE = 12/12

​THEY STARTED WITH ONE WHOLE PIZZA.

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