Lesson 7 of 8 ยท Grades 4 to 5
Practice: Adding and subtracting decimals
Ten questions on adding and subtracting decimals: place-value columns, money, measurement and two missing-number puzzles.
How to use this page
This page gives you ten more questions on the same idea as the lesson "Adding and subtracting decimals". Work through them at your own speed. Write your answer down or say it out loud before you open the answer box, so you give yourself a real chance to think.
If a question feels hard, go back to the lesson and look at the worked example again. Getting a question wrong is useful; it shows you the part that needs one more look.
Practice questions
Answer all ten questions in your notebook or in your head. Then open each answer to check your work.
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6.3 + 3.2 = ?
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9.5. The tenths add to 5 tenths, and the ones add to 9.
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2.7 + 4.68 = ?
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7.38. Write 2.7 as 2.70, then add place by place.
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9.5 - 4.6 = ?
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4.9. Subtract the tenths and then the ones.
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8.1 - 3.45 = ?
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4.65. Write 8.1 as 8.10 and subtract 3.45 from it.
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1.25 + 2.5 + 0.75 = ?
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4.5. The two parts 1.25 and 0.75 add to 2.00, then add 2.50.
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10 - 6.4 = ?
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3.6. Write 10 as 10.0 and subtract 6.4.
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A bottle holds 1.5 L and another holds 0.85 L. How much is that together?
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2.35 L. 1.50 L + 0.85 L = 2.35 L.
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A plank is 5.2 m long. A piece 3.75 m long is cut off. How much is cut off?
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1.45 m. 5.20 m - 3.75 m = 1.45 m.
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4.06 + 2.7 = ?
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6.76. Write 2.7 as 2.70, then add place by place.
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7.3 - 2.85 = ?
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4.45. Write 7.3 as 7.30 and subtract 2.85 from it.