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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 619 · 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.Round 36125 to the nearest thousand.
  2. 2.Which is closest to 503 × 89? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  3. 3.Round 34.79 to one decimal place. =
  4. 4.Round 73.68 to one decimal place. =
  5. 5.Round 56587 to the nearest ten.
  6. 6.Which is closest to 295 + 701 + 203? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  7. 7.Round 71092 to the nearest hundred.
  8. 8.Which is closest to 96 + 301 + 101? (a) 600 (b) 500 (c) 700 (d) 400
  9. 9.Which is closest to 1202 ÷ 19? (a) 120 (b) 600 (c) 30 (d) 60
  10. 10.Round 14.22 to one decimal place. =
  11. 11.Round 35.21 to one decimal place. =
  12. 12.Which is closest to 302 + 805 + 104? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  13. 13.Round 96.73 to one decimal place. =
  14. 14.Which is closest to 498 × 29? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  15. 15.Round 18.64 to one decimal place. =
  16. 16.Which is closest to 396 ÷ 21? (a) 40 (b) 10 (c) 20 (d) 200
  17. 17.Which is closest to 596 × 89? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  18. 18.Which is closest to 296 × 41? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  19. 19.Round 83487 to the nearest hundred.
  20. 20.Which is closest to 2398 ÷ 29? (a) 40 (b) 160 (c) 80 (d) 800
  21. 21.Which is closest to 1494 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  22. 22.Which is closest to 901 × 21? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  23. 23.Which is closest to 907 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  24. 24.Which is closest to 204 × 70? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  25. 25.Round 21.31 to one decimal place. =
  26. 26.Round 46.67 to one decimal place. =
  27. 27.Round 31.63 to one decimal place. =
  28. 28.Which is closest to 1203 ÷ 41? (a) 30 (b) 60 (c) 300 (d) 15
  29. 29.Which is closest to 496 + 297 + 799? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  30. 30.Which is closest to 702 + 202 + 97? (a) 1000 (b) 1200 (c) 1100 (d) 900
  31. 31.Round 57.17 to one decimal place. =
  32. 32.Round 15552 to the nearest ten.
  33. 33.Which is closest to 1997 ÷ 51? (a) 40 (b) 80 (c) 20 (d) 400
  34. 34.Which is closest to 301 + 704 + 895? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  35. 35.Which is closest to 697 × 19? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  36. 36.Round 10384 to the nearest thousand.
  37. 37.Which is closest to 600 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  38. 38.Which is closest to 302 × 18? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  39. 39.Round 33.31 to one decimal place. =
  40. 40.Round 34.89 to one decimal place. =

Answer key

  1. 36000
  2. 45000
  3. 34.8
  4. 73.7
  5. 56590
  6. 1200
  7. 71100
  8. 500
  9. 60
  10. 14.2
  11. 35.2
  12. 1200
  13. 96.7
  14. 15000
  15. 18.6
  16. 20
  17. 54000
  18. 12000
  19. 83500
  20. 80
  21. 50
  22. 18000
  23. 30
  24. 14000
  25. 21.3
  26. 46.7
  27. 31.6
  28. 30
  29. 1600
  30. 1000
  31. 57.2
  32. 15550
  33. 40
  34. 1900
  35. 14000
  36. 10000
  37. 20
  38. 6000
  39. 33.3
  40. 34.9

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