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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 649 · 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 600 × 21? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  2. 2.Which is closest to 1207 ÷ 21? (a) 600 (b) 30 (c) 60 (d) 120
  3. 3.Which is closest to 498 × 40? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  4. 4.Which is closest to 705 + 396 + 100? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  5. 5.Which is closest to 896 × 59? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  6. 6.Round 37046 to the nearest hundred.
  7. 7.Which is closest to 302 × 60? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  8. 8.Which is closest to 503 + 497 + 299? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  9. 9.Which is closest to 403 × 41? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  10. 10.Round 51.49 to one decimal place. =
  11. 11.Which is closest to 602 + 195 + 795? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  12. 12.Round 30.74 to one decimal place. =
  13. 13.Which is closest to 1008 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  14. 14.Which is closest to 398 × 28? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  15. 15.Round 82.78 to one decimal place. =
  16. 16.Which is closest to 1206 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  17. 17.Round 27440 to the nearest hundred.
  18. 18.Round 9628 to the nearest ten.
  19. 19.Which is closest to 196 × 58? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  20. 20.Which is closest to 697 × 72? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
  21. 21.Round 25.74 to one decimal place. =
  22. 22.Which is closest to 300 + 801 + 597? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  23. 23.Which is closest to 598 + 605 + 301? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  24. 24.Round 32.16 to one decimal place. =
  25. 25.Which is closest to 3991 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  26. 26.Which is closest to 699 × 51? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  27. 27.Round 11038 to the nearest thousand.
  28. 28.Which is closest to 902 × 81? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  29. 29.Round 17250 to the nearest thousand.
  30. 30.Which is closest to 1399 ÷ 21? (a) 35 (b) 700 (c) 140 (d) 70
  31. 31.Which is closest to 1008 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  32. 32.Round 82.06 to one decimal place. =
  33. 33.Round 78206 to the nearest thousand.
  34. 34.Round 40.08 to one decimal place. =
  35. 35.Which is closest to 898 × 38? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  36. 36.Which is closest to 598 × 39? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  37. 37.Round 19.19 to one decimal place. =
  38. 38.Round 42.12 to one decimal place. =
  39. 39.Which is closest to 304 + 600 + 398? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  40. 40.Which is closest to 593 ÷ 19? (a) 60 (b) 300 (c) 15 (d) 30

Answer key

  1. 12000
  2. 60
  3. 20000
  4. 1200
  5. 54000
  6. 37000
  7. 18000
  8. 1300
  9. 16000
  10. 51.5
  11. 1600
  12. 30.7
  13. 20
  14. 12000
  15. 82.8
  16. 60
  17. 27400
  18. 9630
  19. 12000
  20. 49000
  21. 25.7
  22. 1700
  23. 1500
  24. 32.2
  25. 80
  26. 35000
  27. 11000
  28. 72000
  29. 17000
  30. 70
  31. 20
  32. 82.1
  33. 78000
  34. 40.1
  35. 36000
  36. 24000
  37. 19.2
  38. 42.1
  39. 1300
  40. 30

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