Grade 3 Math Practice Test: Rounding and Estimation
- Rounding and Estimation
- 10 questions
- 12 minutes
These 10 questions practice rounding whole numbers to the nearest ten or hundred and using rounded numbers to estimate. Tip: look only at the digit to the right of the place you are rounding to; 5 or more rounds up.
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 47 rounded to the nearest ten?
Correct answer: B
The ones digit is 7, which is 5 or more, so 47 rounds up to 50. 40 would be correct only if the ones digit were less than 5.
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Question 2
What is 362 rounded to the nearest hundred?
Correct answer: D
To round to the nearest hundred, look at the tens digit. It is 6, so 362 rounds up to 400. 360 is 362 rounded to the nearest ten, not the nearest hundred.
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Question 3
What is 685 rounded to the nearest ten?
Correct answer: A
The ones digit is 5, so round up: 685 becomes 690. 700 is the answer for rounding to the nearest hundred.
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Question 4
Which number rounds to 500 when it is rounded to the nearest hundred?
Correct answer: C
549 is between 500 and 600, and its tens digit is 4, so it rounds down to 500. 551 has a tens digit of 5, so it rounds up to 600.
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Question 5
What is 250 rounded to the nearest hundred?
Correct answer: A
The tens digit is 5, and a 5 means round up, so 250 rounds to 300. Even though 250 is exactly halfway, the rule says to round up.
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Question 6
Estimate 312 + 489 by rounding each number to the nearest hundred.
Correct answer: B
312 rounds to 300 and 489 rounds to 500, so the estimate is 300 + 500 = 800. 801 is the exact sum, not the estimate.
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Question 7
A school has 278 students in the morning program and 194 students in the afternoon program. Round each number to the nearest ten. About how many more students are in the morning program?
Correct answer: C
278 rounds to 280 and 194 rounds to 190, so the estimate is 280 - 190 = 90. 84 is the exact difference, which the question did not ask for.
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Question 8
Which number rounds to 70 when it is rounded to the nearest ten?
Correct answer: D
66 has a ones digit of 6, so it rounds up to 70. 64 rounds down to 60, and 75 and 77 both round up to 80.
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Question 9
What is the smallest whole number that rounds to 300 when it is rounded to the nearest hundred?
Correct answer: A
Numbers from 250 to 349 round to 300, so the smallest is 250. 249 has a tens digit of 4, so it rounds down to 200.
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Question 10
A book has 196 pages. Maria has read 103 pages. Round each number to the nearest hundred. About how many pages does Maria have left to read?
Correct answer: C
196 rounds to 200 and 103 rounds to 100, so about 200 - 100 = 100 pages are left. 300 comes from adding the numbers instead of subtracting.
Questions you leave blank are not counted as wrong.
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