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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 435 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 895 + 897 + 199? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  2. 2.Which is closest to 795 + 704 + 600? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  3. 3.Which is closest to 1005 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  4. 4.Which is closest to 298 × 80? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  5. 5.Which is closest to 502 × 88? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  6. 6.Round 93258 to the nearest hundred.
  7. 7.Round 3582 to the nearest ten.
  8. 8.Round 20665 to the nearest hundred.
  9. 9.Round 57.56 to one decimal place. =
  10. 10.Which is closest to 498 × 80? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  11. 11.Round 90.64 to one decimal place. =
  12. 12.Round 27846 to the nearest hundred.
  13. 13.Which is closest to 807 ÷ 19? (a) 80 (b) 400 (c) 20 (d) 40
  14. 14.Which is closest to 905 + 595 + 395? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  15. 15.Round 75.24 to one decimal place. =
  16. 16.Which is closest to 599 + 202 + 604? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  17. 17.Which is closest to 696 + 99 + 97? (a) 1100 (b) 1000 (c) 800 (d) 900
  18. 18.Which is closest to 203 × 72? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  19. 19.Round 84909 to the nearest hundred.
  20. 20.Which is closest to 701 × 22? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  21. 21.Round 77446 to the nearest ten.
  22. 22.Which is closest to 402 × 29? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  23. 23.Round 30659 to the nearest ten.
  24. 24.Round 37017 to the nearest hundred.
  25. 25.Round 35480 to the nearest thousand.
  26. 26.Round 56.16 to one decimal place. =
  27. 27.Round 92.26 to one decimal place. =
  28. 28.Round 19.14 to one decimal place. =
  29. 29.Which is closest to 1201 ÷ 41? (a) 30 (b) 15 (c) 60 (d) 300
  30. 30.Round 38092 to the nearest hundred.
  31. 31.Round 83.07 to one decimal place. =
  32. 32.Which is closest to 98 + 395 + 697? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  33. 33.Which is closest to 598 + 397 + 803? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  34. 34.Which is closest to 2003 ÷ 51? (a) 40 (b) 20 (c) 80 (d) 400
  35. 35.Which is closest to 298 × 71? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  36. 36.Round 36020 to the nearest hundred.
  37. 37.Which is closest to 302 × 22? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  38. 38.Which is closest to 1604 ÷ 19? (a) 80 (b) 160 (c) 40 (d) 800
  39. 39.Round 17.18 to one decimal place. =
  40. 40.Round 97.67 to one decimal place. =

Answer key

  1. 2000
  2. 2100
  3. 20
  4. 24000
  5. 45000
  6. 93300
  7. 3580
  8. 20700
  9. 57.6
  10. 40000
  11. 90.6
  12. 27800
  13. 40
  14. 1900
  15. 75.2
  16. 1400
  17. 900
  18. 14000
  19. 84900
  20. 14000
  21. 77450
  22. 12000
  23. 30660
  24. 37000
  25. 35000
  26. 56.2
  27. 92.3
  28. 19.1
  29. 30
  30. 38100
  31. 83.1
  32. 1200
  33. 1800
  34. 40
  35. 21000
  36. 36000
  37. 6000
  38. 80
  39. 17.2
  40. 97.7

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