1. Round 47 to the nearest ten.
- A40
- B45
- C50
- D60
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Answer: C) 50
The ones digit is 7, which is 5 or more, so round up. 47 rounds to 50.
Class 6 Estimation and Rounding — practice questions with answers
Numbers · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. Which number rounds to 600 when rounded to the nearest hundred?
- A549
- B551
- C651
- D655
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Answer: B) 551
Numbers from 550 to 649 round to 600. 549 rounds to 500, 651 and 655 round to 700, but 551 lies in 550-649 so it rounds to 600.
3. Round 1,49,999 to the nearest lakh (nearest 1,00,000).
- A1,00,000
- B1,40,000
- C1,50,000
- D2,00,000
Show answer
Answer: A) 1,00,000
The ten-thousands digit is 4, which is less than 5, so round down. 1,49,999 rounds to 1,00,000.
4. Two villages have populations 7,492 and 7,512.
Both are rounded to the nearest thousand for a survey.
After rounding, what is the difference between the two rounded populations?
Both are rounded to the nearest thousand for a survey.
After rounding, what is the difference between the two rounded populations?
- A1100
- B900
- C1000
- D2000
Show answer
Answer: C) 1000
7,492 rounds to 7,000 (hundreds digit 4). 7,512 rounds to 8,000 (hundreds digit 5). Difference = 8,000 - 7,000 = 1,000.
5. An organiser expects each of 38 schools to send about 29 students to a quiz in Lucknow.
First he estimates the total by rounding each number to the nearest ten.
Then he finds the exact total.
By how much does his estimate differ from the exact total?
First he estimates the total by rounding each number to the nearest ten.
Then he finds the exact total.
By how much does his estimate differ from the exact total?
- A108
- B196
- C98
- D88
Show answer
Answer: C) 98
Estimate: 38 -> 40, 29 -> 30, so 40 x 30 = 1,200. Exact: 38 x 29 = 1,102. Difference = 1,200 - 1,102 = 98.
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