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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 636 · 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 1199 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
  2. 2.Which is closest to 296 × 61? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  3. 3.Which is closest to 695 + 595 + 703? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  4. 4.Which is closest to 603 + 701 + 298? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  5. 5.Round 80.28 to one decimal place. =
  6. 6.Which is closest to 3591 ÷ 39? (a) 90 (b) 45 (c) 180 (d) 900
  7. 7.Which is closest to 504 + 196 + 597? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  8. 8.Which is closest to 99 + 303 + 503? (a) 800 (b) 900 (c) 1000 (d) 1100
  9. 9.Which is closest to 696 + 99 + 96? (a) 1000 (b) 1100 (c) 900 (d) 800
  10. 10.Which is closest to 1604 ÷ 39? (a) 400 (b) 40 (c) 80 (d) 20
  11. 11.Which is closest to 303 × 38? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  12. 12.Which is closest to 1209 ÷ 21? (a) 30 (b) 60 (c) 600 (d) 120
  13. 13.Which is closest to 302 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  14. 14.Which is closest to 805 + 796 + 496? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  15. 15.Which is closest to 503 + 398 + 704? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  16. 16.Which is closest to 592 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  17. 17.Round 25368 to the nearest ten.
  18. 18.Which is closest to 202 + 103 + 895? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  19. 19.Which is closest to 1204 ÷ 19? (a) 600 (b) 30 (c) 60 (d) 120
  20. 20.Which is closest to 201 × 22? (Round each number first.) (a) 4000 (b) 400 (c) 40000 (d) 8000
  21. 21.Which is closest to 298 × 39? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  22. 22.Which is closest to 800 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  23. 23.Round 87.36 to one decimal place. =
  24. 24.Which is closest to 402 × 80? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  25. 25.Round 82031 to the nearest ten.
  26. 26.Which is closest to 396 + 699 + 697? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  27. 27.Round 4462 to the nearest thousand.
  28. 28.Which is closest to 795 + 499 + 204? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  29. 29.Which is closest to 603 × 79? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  30. 30.Which is closest to 796 + 298 + 501? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  31. 31.Round 33.63 to one decimal place. =
  32. 32.Which is closest to 397 × 40? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  33. 33.Round 96.71 to one decimal place. =
  34. 34.Which is closest to 698 × 58? (Round each number first.) (a) 420000 (b) 42000 (c) 4200 (d) 84000
  35. 35.Which is closest to 803 × 79? (Round each number first.) (a) 128000 (b) 6400 (c) 64000 (d) 640000
  36. 36.Which is closest to 401 × 79? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  37. 37.Round 75.61 to one decimal place. =
  38. 38.Round 83391 to the nearest ten.
  39. 39.Round 76.48 to one decimal place. =
  40. 40.Which is closest to 200 + 495 + 198? (a) 900 (b) 1100 (c) 800 (d) 1000

Answer key

  1. 30
  2. 18000
  3. 2000
  4. 1600
  5. 80.3
  6. 90
  7. 1300
  8. 900
  9. 900
  10. 40
  11. 12000
  12. 60
  13. 6000
  14. 2100
  15. 1600
  16. 20
  17. 25370
  18. 1200
  19. 60
  20. 4000
  21. 12000
  22. 20
  23. 87.4
  24. 32000
  25. 82030
  26. 1800
  27. 4000
  28. 1500
  29. 48000
  30. 1600
  31. 33.6
  32. 16000
  33. 96.7
  34. 42000
  35. 64000
  36. 32000
  37. 75.6
  38. 83390
  39. 76.5
  40. 900

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