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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 762 · 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 404 × 78? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
  2. 2.Round 27.53 to one decimal place. =
  3. 3.Which is closest to 896 × 52? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  4. 4.Round 99969 to the nearest hundred.
  5. 5.Which is closest to 604 + 695 + 298? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  6. 6.Which is closest to 203 × 79? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  7. 7.Which is closest to 1501 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  8. 8.Round 84103 to the nearest hundred.
  9. 9.Which is closest to 598 + 799 + 902? (a) 2400 (b) 2500 (c) 2300 (d) 2200
  10. 10.Round 72285 to the nearest thousand.
  11. 11.Which is closest to 702 + 597 + 700? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  12. 12.Which is closest to 698 × 48? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  13. 13.Which is closest to 597 × 39? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  14. 14.Which is closest to 196 × 18? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
  15. 15.Which is closest to 991 ÷ 19? (a) 50 (b) 500 (c) 25 (d) 100
  16. 16.Round 64074 to the nearest hundred.
  17. 17.Which is closest to 792 ÷ 19? (a) 80 (b) 20 (c) 40 (d) 400
  18. 18.Round 76.47 to one decimal place. =
  19. 19.Which is closest to 498 × 40? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  20. 20.Which is closest to 894 ÷ 29? (a) 300 (b) 60 (c) 15 (d) 30
  21. 21.Which is closest to 4502 ÷ 51? (a) 90 (b) 180 (c) 45 (d) 900
  22. 22.Which is closest to 698 × 40? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  23. 23.Which is closest to 696 × 61? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  24. 24.Which is closest to 907 ÷ 31? (a) 60 (b) 300 (c) 30 (d) 15
  25. 25.Which is closest to 795 + 196 + 795? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  26. 26.Round 32.26 to one decimal place. =
  27. 27.Round 68960 to the nearest thousand.
  28. 28.Round 80.26 to one decimal place. =
  29. 29.Which is closest to 1803 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  30. 30.Round 45426 to the nearest hundred.
  31. 31.Round 37488 to the nearest hundred.
  32. 32.Which is closest to 1994 ÷ 49? (a) 40 (b) 80 (c) 400 (d) 20
  33. 33.Round 49.54 to one decimal place. =
  34. 34.Which is closest to 1199 ÷ 39? (a) 15 (b) 60 (c) 300 (d) 30
  35. 35.Round 83061 to the nearest hundred.
  36. 36.Which is closest to 97 + 795 + 404? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  37. 37.Round 69.93 to one decimal place. =
  38. 38.Which is closest to 1993 ÷ 41? (a) 100 (b) 50 (c) 25 (d) 500
  39. 39.Round 78392 to the nearest hundred.
  40. 40.Round 74.11 to one decimal place. =

Answer key

  1. 32000
  2. 27.5
  3. 45000
  4. 100000
  5. 1600
  6. 16000
  7. 30
  8. 84100
  9. 2300
  10. 72000
  11. 2000
  12. 35000
  13. 24000
  14. 4000
  15. 50
  16. 64100
  17. 40
  18. 76.5
  19. 20000
  20. 30
  21. 90
  22. 28000
  23. 42000
  24. 30
  25. 1800
  26. 32.3
  27. 69000
  28. 80.3
  29. 90
  30. 45400
  31. 37500
  32. 40
  33. 49.5
  34. 30
  35. 83100
  36. 1300
  37. 69.9
  38. 50
  39. 78400
  40. 74.1

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