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

A rope is 9/10 meter long. Juan cuts off 2/5 meter for a project. How much rope is left?

Question 2 of 3

A container holds 2.4 liters of orange juice. If you divide it equally into 3 bottles, how many liters will each bottle contain?

Question 3 of 3

A smoothie blend uses 0.8 kg of fruit. If you want to make 5 smoothies of equal size, how much fruit is in each smoothie?

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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