IXL | Add and subtract mixed numbers with unlike denominators: word problems

At the Arcadia Zoo's bug exhibit, Zack watches a millipede crawl for 2 4/6 minutes, stay still for a while, and then crawl for 10 3/12 minutes more. How much total time did Zack spend watching the millipede crawl?

Write your answer as a fraction or as a whole or mixed number.

minutes

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Learn with an example

question

The gas tank in Dalton's motorcycle can hold 6 1/2 gallons. If he puts 3 3/10 gallons into the tank, how much more will he need to add to fill the tank completely?

Write your answer as a fraction or as a whole or mixed number.

gallons

solution

Find how much more Dalton needs to add to fill the tank by subtracting 3 3/10 from 6 1/2.

The least common denominator of 2 and 10 is 10.

Write

with 10 as the denominator.

Now subtract. Remember to subtract whole numbers from whole numbers and fractions from fractions.

−

Now simplify.

Write the answer.

−

Dalton needs to add 3 1/5 gallons to fill the tank.

Looking for more? Try these:

Lesson: Adding mixed numbers

Lesson: Subtracting mixed numbers

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M.3Add mixed numbers with unlike denominators

M.4Subtract mixed numbers with unlike denominators

Add and subtract mixed numbers with unlike denominators

Lesson: Adding mixed numbers

Lesson: Subtracting mixed numbers

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