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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 480 · 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 2492 ÷ 51? (a) 500 (b) 25 (c) 100 (d) 50
  2. 2.Which is closest to 498 × 31? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  3. 3.Which is closest to 199 × 88? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  4. 4.Which is closest to 409 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  5. 5.Round 89.26 to one decimal place. =
  6. 6.Round 25779 to the nearest ten.
  7. 7.Which is closest to 704 + 200 + 495? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  8. 8.Round 84006 to the nearest hundred.
  9. 9.Round 64.29 to one decimal place. =
  10. 10.Which is closest to 198 × 70? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  11. 11.Round 44467 to the nearest thousand.
  12. 12.Which is closest to 302 × 39? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  13. 13.Round 15035 to the nearest thousand.
  14. 14.Which is closest to 902 + 95 + 198? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  15. 15.Which is closest to 900 + 299 + 396? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  16. 16.Round 89329 to the nearest ten.
  17. 17.Round 72925 to the nearest hundred.
  18. 18.Round 25903 to the nearest thousand.
  19. 19.Which is closest to 97 + 99 + 701? (a) 1000 (b) 800 (c) 1100 (d) 900
  20. 20.Which is closest to 595 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  21. 21.Which is closest to 402 × 79? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000
  22. 22.Which is closest to 295 + 404 + 398? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  23. 23.Which is closest to 898 + 696 + 303? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  24. 24.Which is closest to 497 + 298 + 305? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  25. 25.Which is closest to 96 + 897 + 105? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  26. 26.Which is closest to 2495 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  27. 27.Round 23.24 to one decimal place. =
  28. 28.Which is closest to 899 × 78? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  29. 29.Which is closest to 900 + 401 + 805? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  30. 30.Which is closest to 95 + 395 + 199? (a) 800 (b) 600 (c) 700 (d) 900
  31. 31.Which is closest to 303 × 22? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  32. 32.Which is closest to 303 + 397 + 696? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  33. 33.Which is closest to 599 × 40? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  34. 34.Which is closest to 301 × 78? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  35. 35.Which is closest to 703 × 49? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  36. 36.Which is closest to 3200 ÷ 41? (a) 800 (b) 160 (c) 40 (d) 80
  37. 37.Which is closest to 198 × 28? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  38. 38.Which is closest to 302 + 597 + 501? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  39. 39.Which is closest to 302 × 88? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  40. 40.Which is closest to 2103 ÷ 31? (a) 35 (b) 700 (c) 140 (d) 70

Answer key

  1. 50
  2. 15000
  3. 18000
  4. 20
  5. 89.3
  6. 25780
  7. 1400
  8. 84000
  9. 64.3
  10. 14000
  11. 44000
  12. 12000
  13. 15000
  14. 1200
  15. 1600
  16. 89330
  17. 72900
  18. 26000
  19. 900
  20. 30
  21. 32000
  22. 1100
  23. 1900
  24. 1100
  25. 1100
  26. 50
  27. 23.2
  28. 72000
  29. 2100
  30. 700
  31. 6000
  32. 1400
  33. 24000
  34. 24000
  35. 35000
  36. 80
  37. 6000
  38. 1400
  39. 27000
  40. 70

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