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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 27 · 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 600 × 52? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  2. 2.Round 44.63 to one decimal place. =
  3. 3.Which is closest to 402 × 78? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  4. 4.Which is closest to 299 + 903 + 600? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  5. 5.Round 58.66 to one decimal place. =
  6. 6.Round 28.81 to one decimal place. =
  7. 7.Which is closest to 1006 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  8. 8.Round 15953 to the nearest ten.
  9. 9.Which is closest to 204 × 70? (Round each number first.) (a) 28000 (b) 14000 (c) 140000 (d) 1400
  10. 10.Which is closest to 603 × 28? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  11. 11.Round 97.42 to one decimal place. =
  12. 12.Round 23.44 to one decimal place. =
  13. 13.Which is closest to 398 + 96 + 403? (a) 900 (b) 1000 (c) 1100 (d) 800
  14. 14.Which is closest to 903 × 89? (Round each number first.) (a) 162000 (b) 810000 (c) 8100 (d) 81000
  15. 15.Round 10.88 to one decimal place. =
  16. 16.Which is closest to 998 ÷ 21? (a) 50 (b) 25 (c) 500 (d) 100
  17. 17.Round 51.78 to one decimal place. =
  18. 18.Which is closest to 703 × 60? (Round each number first.) (a) 84000 (b) 42000 (c) 4200 (d) 420000
  19. 19.Which is closest to 200 × 68? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  20. 20.Round 5721 to the nearest thousand.
  21. 21.Round 13567 to the nearest ten.
  22. 22.Round 43.64 to one decimal place. =
  23. 23.Round 99.44 to one decimal place. =
  24. 24.Which is closest to 897 × 20? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  25. 25.Which is closest to 1395 ÷ 19? (a) 70 (b) 35 (c) 140 (d) 700
  26. 26.Which is closest to 703 × 48? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  27. 27.Which is closest to 299 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  28. 28.Round 35.73 to one decimal place. =
  29. 29.Which is closest to 801 × 41? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  30. 30.Which is closest to 802 + 795 + 604? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  31. 31.Which is closest to 696 × 50? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  32. 32.Round 19.24 to one decimal place. =
  33. 33.Which is closest to 602 ÷ 31? (a) 40 (b) 10 (c) 200 (d) 20
  34. 34.Which is closest to 602 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  35. 35.Round 15361 to the nearest ten.
  36. 36.Which is closest to 1197 ÷ 31? (a) 40 (b) 400 (c) 20 (d) 80
  37. 37.Which is closest to 602 × 19? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  38. 38.Which is closest to 795 ÷ 39? (a) 40 (b) 20 (c) 10 (d) 200
  39. 39.Which is closest to 1204 ÷ 19? (a) 30 (b) 120 (c) 600 (d) 60
  40. 40.Round 96911 to the nearest thousand.

Answer key

  1. 30000
  2. 44.6
  3. 32000
  4. 1800
  5. 58.7
  6. 28.8
  7. 50
  8. 15950
  9. 14000
  10. 18000
  11. 97.4
  12. 23.4
  13. 900
  14. 81000
  15. 10.9
  16. 50
  17. 51.8
  18. 42000
  19. 14000
  20. 6000
  21. 13570
  22. 43.6
  23. 99.4
  24. 18000
  25. 70
  26. 35000
  27. 6000
  28. 35.7
  29. 32000
  30. 2200
  31. 35000
  32. 19.2
  33. 20
  34. 30
  35. 15360
  36. 40
  37. 12000
  38. 20
  39. 60
  40. 97000

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