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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 928 · 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 8852 to the nearest thousand.
  2. 2.Which is closest to 504 × 48? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  3. 3.Which is closest to 900 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  4. 4.Which is closest to 203 × 71? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  5. 5.Round 20.87 to one decimal place. =
  6. 6.Round 67391 to the nearest thousand.
  7. 7.Round 22.84 to one decimal place. =
  8. 8.Which is closest to 400 × 49? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  9. 9.Which is closest to 496 × 71? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  10. 10.Which is closest to 3191 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  11. 11.Which is closest to 497 × 32? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  12. 12.Round 86150 to the nearest thousand.
  13. 13.Which is closest to 3192 ÷ 41? (a) 160 (b) 800 (c) 80 (d) 40
  14. 14.Round 29.39 to one decimal place. =
  15. 15.Which is closest to 803 + 900 + 497? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  16. 16.Round 17259 to the nearest ten.
  17. 17.Which is closest to 798 + 204 + 397? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  18. 18.Round 97606 to the nearest thousand.
  19. 19.Round 73.89 to one decimal place. =
  20. 20.Which is closest to 97 + 398 + 396? (a) 1000 (b) 1100 (c) 800 (d) 900
  21. 21.Which is closest to 1208 ÷ 21? (a) 60 (b) 120 (c) 30 (d) 600
  22. 22.Round 35.94 to one decimal place. =
  23. 23.Round 43099 to the nearest hundred.
  24. 24.Which is closest to 196 × 18? (Round each number first.) (a) 400 (b) 4000 (c) 40000 (d) 8000
  25. 25.Which is closest to 698 × 28? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  26. 26.Which is closest to 2508 ÷ 49? (a) 50 (b) 100 (c) 25 (d) 500
  27. 27.Which is closest to 1491 ÷ 51? (a) 30 (b) 300 (c) 15 (d) 60
  28. 28.Which is closest to 3206 ÷ 41? (a) 160 (b) 800 (c) 40 (d) 80
  29. 29.Which is closest to 896 × 52? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  30. 30.Which is closest to 195 + 200 + 904? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  31. 31.Which is closest to 596 + 496 + 698? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  32. 32.Round 92.57 to one decimal place. =
  33. 33.Round 62517 to the nearest ten.
  34. 34.Round 30.26 to one decimal place. =
  35. 35.Which is closest to 403 × 78? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  36. 36.Round 30.36 to one decimal place. =
  37. 37.Which is closest to 601 × 80? (Round each number first.) (a) 48000 (b) 4800 (c) 96000 (d) 480000
  38. 38.Round 34.26 to one decimal place. =
  39. 39.Round 30235 to the nearest thousand.
  40. 40.Which is closest to 592 ÷ 31? (a) 200 (b) 20 (c) 10 (d) 40

Answer key

  1. 9000
  2. 25000
  3. 30
  4. 14000
  5. 20.9
  6. 67000
  7. 22.8
  8. 20000
  9. 35000
  10. 80
  11. 15000
  12. 86000
  13. 80
  14. 29.4
  15. 2200
  16. 17260
  17. 1400
  18. 98000
  19. 73.9
  20. 900
  21. 60
  22. 35.9
  23. 43100
  24. 4000
  25. 21000
  26. 50
  27. 30
  28. 80
  29. 45000
  30. 1300
  31. 1800
  32. 92.6
  33. 62520
  34. 30.3
  35. 32000
  36. 30.4
  37. 48000
  38. 34.3
  39. 30000
  40. 20

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