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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 121 · 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 705 + 704 + 297? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  2. 2.Which is closest to 603 × 71? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  3. 3.Round 78657 to the nearest ten.
  4. 4.Round 11867 to the nearest thousand.
  5. 5.Which is closest to 498 × 88? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  6. 6.Round 49953 to the nearest thousand.
  7. 7.Which is closest to 1802 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  8. 8.Round 99.77 to one decimal place. =
  9. 9.Which is closest to 1607 ÷ 21? (a) 80 (b) 160 (c) 40 (d) 800
  10. 10.Round 82.33 to one decimal place. =
  11. 11.Round 91.59 to one decimal place. =
  12. 12.Which is closest to 603 ÷ 19? (a) 60 (b) 300 (c) 15 (d) 30
  13. 13.Round 45980 to the nearest thousand.
  14. 14.Which is closest to 796 + 902 + 596? (a) 2300 (b) 2500 (c) 2400 (d) 2200
  15. 15.Which is closest to 199 × 30? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  16. 16.Round 42.89 to one decimal place. =
  17. 17.Which is closest to 4492 ÷ 51? (a) 180 (b) 900 (c) 45 (d) 90
  18. 18.Which is closest to 797 + 398 + 200? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  19. 19.Which is closest to 794 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  20. 20.Which is closest to 804 × 51? (Round each number first.) (a) 80000 (b) 4000 (c) 400000 (d) 40000
  21. 21.Which is closest to 105 + 96 + 303? (a) 600 (b) 400 (c) 700 (d) 500
  22. 22.Round 41017 to the nearest ten.
  23. 23.Round 48457 to the nearest thousand.
  24. 24.Which is closest to 1807 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  25. 25.Which is closest to 798 × 41? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  26. 26.Round 9932 to the nearest ten.
  27. 27.Which is closest to 302 + 796 + 295? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  28. 28.Round 81884 to the nearest thousand.
  29. 29.Which is closest to 1409 ÷ 21? (a) 35 (b) 70 (c) 140 (d) 700
  30. 30.Which is closest to 302 × 79? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  31. 31.Which is closest to 698 × 90? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  32. 32.Which is closest to 598 + 301 + 198? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  33. 33.Which is closest to 95 + 401 + 102? (a) 500 (b) 600 (c) 800 (d) 700
  34. 34.Which is closest to 302 × 42? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  35. 35.Round 10.76 to one decimal place. =
  36. 36.Which is closest to 2996 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  37. 37.Round 81620 to the nearest thousand.
  38. 38.Which is closest to 897 + 605 + 597? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  39. 39.Round 15.16 to one decimal place. =
  40. 40.Round 1418 to the nearest thousand.

Answer key

  1. 1700
  2. 42000
  3. 78660
  4. 12000
  5. 45000
  6. 50000
  7. 60
  8. 99.8
  9. 80
  10. 82.3
  11. 91.6
  12. 30
  13. 46000
  14. 2300
  15. 6000
  16. 42.9
  17. 90
  18. 1400
  19. 40
  20. 40000
  21. 500
  22. 41020
  23. 48000
  24. 60
  25. 32000
  26. 9930
  27. 1400
  28. 82000
  29. 70
  30. 24000
  31. 63000
  32. 1100
  33. 600
  34. 12000
  35. 10.8
  36. 60
  37. 82000
  38. 2100
  39. 15.2
  40. 1000

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