Adding and subtracting fractions with unlike denominators

Find a common denominator, rewrite, then add or subtract the numerators. The most common fraction mistake happens here.

Standards:5.NF.A.15.NF.A.2

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

Maya ate 3/8 of a pizza on Monday and 1/6 of the same pizza on Tuesday. How much of the pizza did she eat in total?

Question 2 of 3

Maya mixed 2/3 cup of orange juice with 1/4 cup of cranberry juice. How much juice did she mix in total?

Question 3 of 3

Maya has 3/5 of a pizza. She eats 1/4 of a pizza. How much pizza does she have left?

How this fits in

Adding and subtracting fractions with unlike denominators is one skill in the Fractions & Decimals unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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