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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 221 · 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 495 + 804 + 804? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  2. 2.Round 99987 to the nearest hundred.
  3. 3.Round 95.43 to one decimal place. =
  4. 4.Which is closest to 497 × 38? (Round each number first.) (a) 200000 (b) 40000 (c) 20000 (d) 2000
  5. 5.Which is closest to 797 + 600 + 597? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  6. 6.Which is closest to 201 × 78? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  7. 7.Round 25.11 to one decimal place. =
  8. 8.Which is closest to 404 × 20? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  9. 9.Which is closest to 1195 ÷ 39? (a) 15 (b) 60 (c) 300 (d) 30
  10. 10.Which is closest to 4000 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  11. 11.Which is closest to 1401 ÷ 19? (a) 700 (b) 140 (c) 35 (d) 70
  12. 12.Which is closest to 102 + 497 + 505? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  13. 13.Round 56.19 to one decimal place. =
  14. 14.Round 13.53 to one decimal place. =
  15. 15.Which is closest to 1806 ÷ 19? (a) 90 (b) 180 (c) 45 (d) 900
  16. 16.Round 32.31 to one decimal place. =
  17. 17.Round 98.29 to one decimal place. =
  18. 18.Round 34195 to the nearest thousand.
  19. 19.Which is closest to 204 + 197 + 505? (a) 1000 (b) 1100 (c) 800 (d) 900
  20. 20.Round 61.88 to one decimal place. =
  21. 21.Which is closest to 3993 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  22. 22.Which is closest to 304 + 199 + 401? (a) 800 (b) 1000 (c) 1100 (d) 900
  23. 23.Which is closest to 400 + 799 + 795? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  24. 24.Which is closest to 99 + 202 + 703? (a) 1200 (b) 1000 (c) 1100 (d) 900
  25. 25.Which is closest to 603 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  26. 26.Which is closest to 602 × 31? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  27. 27.Which is closest to 2996 ÷ 49? (a) 60 (b) 30 (c) 120 (d) 600
  28. 28.Which is closest to 808 ÷ 19? (a) 400 (b) 40 (c) 20 (d) 80
  29. 29.Round 85.86 to one decimal place. =
  30. 30.Round 19.78 to one decimal place. =
  31. 31.Round 80.78 to one decimal place. =
  32. 32.Which is closest to 898 × 49? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  33. 33.Round 44612 to the nearest ten.
  34. 34.Which is closest to 798 + 500 + 404? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  35. 35.Round 51753 to the nearest ten.
  36. 36.Round 92002 to the nearest thousand.
  37. 37.Round 88279 to the nearest hundred.
  38. 38.Which is closest to 898 × 61? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  39. 39.Round 84.63 to one decimal place. =
  40. 40.Which is closest to 396 + 196 + 802? (a) 1500 (b) 1300 (c) 1400 (d) 1600

Answer key

  1. 2100
  2. 100000
  3. 95.4
  4. 20000
  5. 2000
  6. 16000
  7. 25.1
  8. 8000
  9. 30
  10. 80
  11. 70
  12. 1100
  13. 56.2
  14. 13.5
  15. 90
  16. 32.3
  17. 98.3
  18. 34000
  19. 900
  20. 61.9
  21. 80
  22. 900
  23. 2000
  24. 1000
  25. 20
  26. 18000
  27. 60
  28. 40
  29. 85.9
  30. 19.8
  31. 80.8
  32. 45000
  33. 44610
  34. 1700
  35. 51750
  36. 92000
  37. 88300
  38. 54000
  39. 84.6
  40. 1400

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