Adding and Subtracting Unlike Denominators

Front

Can you add fractions with different denominators?

Back

No, you must find a common denominator.

Front

What is the first step to add fractions with unlike denominators?

Back

Find a common denominator.

Front

Lily jumped rope for 1 1/3 of an hour on Monday and 3/5 of an hour on Tuesday. How much time did Lily jump rope?

Back

1 14/15 hours.

Front

You have a bag of potato chips. You give your cousin 1/3 of the bag and your sister 1/5 of the bag. What fraction of the original bag is left for you to eat?

Back

7/15 of the bag.

Front

Drew ate 1/3 of a cake for breakfast and 2/5 of the cake for lunch. How much cake did Drew eat?

Back

11/15 of a cake.

Front

What is 4/5 + 3/6?

Back

1 3/10.

Front

What is a common denominator?

Back

A common denominator is a shared multiple of the denominators of two or more fractions.

Front

How do you find a common denominator for 1/3 and 1/5?

Back

The least common multiple (LCM) of 3 and 5 is 15, so the common denominator is 15.

Front

What is the process to add 1/3 and 2/5?

Back

Convert both fractions to have a common denominator, then add the numerators.

Front

If you have 1/4 and 1/6, what is the common denominator?

Back

The common denominator is 12.