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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 947 · 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 598 + 697 + 495? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  2. 2.Which is closest to 699 × 29? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  3. 3.Which is closest to 599 × 31? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  4. 4.Which is closest to 300 × 31? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  5. 5.Which is closest to 100 + 605 + 804? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  6. 6.Which is closest to 197 × 48? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  7. 7.Which is closest to 301 × 71? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  8. 8.Which is closest to 796 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  9. 9.Round 71.13 to one decimal place. =
  10. 10.Round 61942 to the nearest ten.
  11. 11.Round 30.36 to one decimal place. =
  12. 12.Round 1537 to the nearest ten.
  13. 13.Which is closest to 698 + 401 + 496? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  14. 14.Round 40.83 to one decimal place. =
  15. 15.Round 75.32 to one decimal place. =
  16. 16.Which is closest to 896 × 88? (Round each number first.) (a) 81000 (b) 162000 (c) 810000 (d) 8100
  17. 17.Which is closest to 2702 ÷ 29? (a) 90 (b) 900 (c) 180 (d) 45
  18. 18.Which is closest to 697 + 399 + 895? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  19. 19.Which is closest to 98 + 895 + 398? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  20. 20.Round 47.54 to one decimal place. =
  21. 21.Which is closest to 105 + 799 + 198? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  22. 22.Which is closest to 591 ÷ 31? (a) 40 (b) 10 (c) 200 (d) 20
  23. 23.Which is closest to 591 ÷ 29? (a) 200 (b) 40 (c) 20 (d) 10
  24. 24.Which is closest to 800 × 39? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  25. 25.Which is closest to 402 + 502 + 399? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  26. 26.Which is closest to 204 × 39? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  27. 27.Which is closest to 591 ÷ 21? (a) 15 (b) 60 (c) 30 (d) 300
  28. 28.Which is closest to 1205 ÷ 41? (a) 300 (b) 15 (c) 60 (d) 30
  29. 29.Round 26.68 to one decimal place. =
  30. 30.Which is closest to 199 × 71? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  31. 31.Which is closest to 1597 ÷ 19? (a) 40 (b) 80 (c) 800 (d) 160
  32. 32.Round 22.42 to one decimal place. =
  33. 33.Round 20.91 to one decimal place. =
  34. 34.Which is closest to 2407 ÷ 41? (a) 30 (b) 120 (c) 600 (d) 60
  35. 35.Which is closest to 897 × 22? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  36. 36.Which is closest to 4006 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  37. 37.Which is closest to 902 × 42? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  38. 38.Round 29.06 to one decimal place. =
  39. 39.Which is closest to 502 + 197 + 97? (a) 900 (b) 700 (c) 1000 (d) 800
  40. 40.Round 26.48 to one decimal place. =

Answer key

  1. 1800
  2. 21000
  3. 18000
  4. 9000
  5. 1500
  6. 10000
  7. 21000
  8. 20
  9. 71.1
  10. 61940
  11. 30.4
  12. 1540
  13. 1600
  14. 40.8
  15. 75.3
  16. 81000
  17. 90
  18. 2000
  19. 1400
  20. 47.5
  21. 1100
  22. 20
  23. 20
  24. 32000
  25. 1300
  26. 8000
  27. 30
  28. 30
  29. 26.7
  30. 14000
  31. 80
  32. 22.4
  33. 20.9
  34. 60
  35. 18000
  36. 80
  37. 36000
  38. 29.1
  39. 800
  40. 26.5

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