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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 483 · 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 796 × 28? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  2. 2.Round 68853 to the nearest ten.
  3. 3.Round 23.11 to one decimal place. =
  4. 4.Which is closest to 597 ÷ 31? (a) 40 (b) 20 (c) 10 (d) 200
  5. 5.Which is closest to 394 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  6. 6.Which is closest to 2103 ÷ 29? (a) 35 (b) 70 (c) 140 (d) 700
  7. 7.Which is closest to 595 + 897 + 795? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  8. 8.Which is closest to 1401 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  9. 9.Which is closest to 593 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  10. 10.Round 18406 to the nearest thousand.
  11. 11.Which is closest to 598 × 68? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  12. 12.Round 82.23 to one decimal place. =
  13. 13.Which is closest to 796 + 896 + 604? (a) 2500 (b) 2300 (c) 2400 (d) 2200
  14. 14.Which is closest to 601 × 39? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  15. 15.Which is closest to 699 × 22? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  16. 16.Which is closest to 296 × 69? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  17. 17.Which is closest to 600 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  18. 18.Which is closest to 402 × 81? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  19. 19.Which is closest to 302 + 701 + 896? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  20. 20.Which is closest to 4004 ÷ 49? (a) 800 (b) 80 (c) 40 (d) 160
  21. 21.Which is closest to 303 + 695 + 95? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  22. 22.Which is closest to 300 × 42? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  23. 23.Round 17.72 to one decimal place. =
  24. 24.Which is closest to 904 + 305 + 698? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  25. 25.Round 55.82 to one decimal place. =
  26. 26.Which is closest to 1999 ÷ 39? (a) 25 (b) 50 (c) 100 (d) 500
  27. 27.Which is closest to 105 + 298 + 204? (a) 700 (b) 800 (c) 500 (d) 600
  28. 28.Which is closest to 402 + 495 + 103? (a) 1200 (b) 900 (c) 1100 (d) 1000
  29. 29.Round 85568 to the nearest ten.
  30. 30.Which is closest to 892 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  31. 31.Which is closest to 3596 ÷ 39? (a) 45 (b) 180 (c) 900 (d) 90
  32. 32.Round 91.31 to one decimal place. =
  33. 33.Round 55521 to the nearest ten.
  34. 34.Which is closest to 898 × 71? (Round each number first.) (a) 63000 (b) 126000 (c) 6300 (d) 630000
  35. 35.Which is closest to 695 + 298 + 395? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  36. 36.Which is closest to 96 + 505 + 497? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  37. 37.Round 97537 to the nearest ten.
  38. 38.Which is closest to 403 + 302 + 603? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  39. 39.Which is closest to 499 + 596 + 796? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  40. 40.Which is closest to 901 × 89? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000

Answer key

  1. 24000
  2. 68850
  3. 23.1
  4. 20
  5. 20
  6. 70
  7. 2300
  8. 70
  9. 30
  10. 18000
  11. 42000
  12. 82.2
  13. 2300
  14. 24000
  15. 14000
  16. 21000
  17. 18000
  18. 32000
  19. 1900
  20. 80
  21. 1100
  22. 12000
  23. 17.7
  24. 1900
  25. 55.8
  26. 50
  27. 600
  28. 1000
  29. 85570
  30. 30
  31. 90
  32. 91.3
  33. 55520
  34. 63000
  35. 1400
  36. 1100
  37. 97540
  38. 1300
  39. 1900
  40. 81000

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