Grade 5 Math Practice Test: Adding and Subtracting Decimals
- Adding and Subtracting Decimals
- 10 questions
- 12 minutes
This test practices adding and subtracting decimals to hundredths. Tip: line up the decimal points and write zeros in empty places, so that 8 becomes 8.00 before you subtract.
Tap an option to mark your answer. You can change your mind, or tap the same option again to leave the question blank. The correct answers and explanations appear when you finish the test.Tap an option to answer; tap it again to leave the question blank.
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Question 1
What is 3.47 + 2.6?
Correct answer: D
Write 2.6 as 2.60 and line up the decimal points: 3.47 + 2.60 = 6.07. 3.73 adds 0.26 because the 2.6 was not lined up correctly.
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Question 2
What is 8 − 2.35?
Correct answer: B
Write 8 as 8.00, then 8.00 − 2.35 = 5.65. Check: 5.65 + 2.35 = 8.00.
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Question 3
What is 12.5 + 0.75 + 3?
Correct answer: A
12.50 + 0.75 = 13.25, and 13.25 + 3 = 16.25. 13.55 treats the 3 as 0.3.
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Question 4
What is 10.04 − 7.6?
Correct answer: D
Write 7.6 as 7.60: 10.04 − 7.60 = 2.44. Check: 2.44 + 7.60 = 10.04.
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Question 5
A water bottle holds 1.5 liters. Sam drinks 0.65 liter. How much water is left in the bottle?
Correct answer: A
1.50 − 0.65 = 0.85 liter. Check: 0.85 + 0.65 = 1.50.
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Question 6
Which is the best estimate of 19.87 + 5.12?
Correct answer: C
19.87 is close to 20 and 5.12 is close to 5, so the sum is about 20 + 5 = 25. The exact sum, 24.99, confirms the estimate.
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Question 7
A gymnast earns scores of 9.25, 8.9 and 9.05. What is her total score?
Correct answer: D
9.25 + 8.90 + 9.05 = 27.20 = 27.2. 27.02 comes from writing 8.9 as 8.09.
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Question 8
What number makes this equation true?
▢ + 4.8 = 7.25
Correct answer: C
Subtract to find the missing addend: 7.25 − 4.80 = 2.45. 12.05 adds the two numbers instead of subtracting.
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Question 9
Leo had $20. He spent $6.49 on a book and $8.75 on a T-shirt. How much money does he have left?
Correct answer: B
He spent $6.49 + $8.75 = $15.24, and $20.00 − $15.24 = $4.76. $15.24 is the amount he spent, not the amount left.
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Question 10
A tank had 45.3 gallons of water. Then 12.75 gallons were used, and 8.5 gallons were added. How much water is in the tank now?
Correct answer: C
45.30 − 12.75 = 32.55, and 32.55 + 8.50 = 41.05 gallons. 24.05 subtracts the 8.5 gallons that were added.
Questions you leave blank are not counted as wrong.
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