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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 926 · 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.Round 60.42 to one decimal place. =
  2. 2.Which is closest to 203 × 89? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  3. 3.Which is closest to 100 + 802 + 900? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  4. 4.Round 75.46 to one decimal place. =
  5. 5.Which is closest to 596 × 78? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  6. 6.Round 88713 to the nearest thousand.
  7. 7.Which is closest to 704 × 22? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  8. 8.Round 91232 to the nearest ten.
  9. 9.Which is closest to 805 + 303 + 95? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  10. 10.Which is closest to 396 × 48? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  11. 11.Which is closest to 1198 ÷ 39? (a) 60 (b) 300 (c) 15 (d) 30
  12. 12.Which is closest to 300 + 801 + 496? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  13. 13.Which is closest to 503 + 905 + 799? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  14. 14.Round 98445 to the nearest hundred.
  15. 15.Which is closest to 795 ÷ 39? (a) 40 (b) 20 (c) 200 (d) 10
  16. 16.Which is closest to 797 ÷ 21? (a) 400 (b) 80 (c) 40 (d) 20
  17. 17.Round 35.13 to one decimal place. =
  18. 18.Round 85.11 to one decimal place. =
  19. 19.Round 32.87 to one decimal place. =
  20. 20.Which is closest to 4002 ÷ 51? (a) 800 (b) 40 (c) 80 (d) 160
  21. 21.Which is closest to 399 × 58? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  22. 22.Round 6901 to the nearest hundred.
  23. 23.Round 87616 to the nearest thousand.
  24. 24.Which is closest to 1194 ÷ 29? (a) 40 (b) 20 (c) 400 (d) 80
  25. 25.Which is closest to 3501 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  26. 26.Which is closest to 505 + 296 + 795? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  27. 27.Which is closest to 300 × 39? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  28. 28.Round 29.66 to one decimal place. =
  29. 29.Round 12.62 to one decimal place. =
  30. 30.Which is closest to 3992 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
  31. 31.Round 40.63 to one decimal place. =
  32. 32.Which is closest to 105 + 705 + 502? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  33. 33.Which is closest to 1208 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  34. 34.Which is closest to 991 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  35. 35.Which is closest to 99 + 595 + 405? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  36. 36.Which is closest to 606 ÷ 31? (a) 200 (b) 20 (c) 10 (d) 40
  37. 37.Round 56.51 to one decimal place. =
  38. 38.Which is closest to 897 × 38? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  39. 39.Round 69.28 to one decimal place. =
  40. 40.Which is closest to 3200 ÷ 41? (a) 40 (b) 80 (c) 800 (d) 160

Answer key

  1. 60.4
  2. 18000
  3. 1800
  4. 75.5
  5. 48000
  6. 89000
  7. 14000
  8. 91230
  9. 1200
  10. 20000
  11. 30
  12. 1600
  13. 2200
  14. 98400
  15. 20
  16. 40
  17. 35.1
  18. 85.1
  19. 32.9
  20. 80
  21. 24000
  22. 6900
  23. 88000
  24. 40
  25. 70
  26. 1600
  27. 12000
  28. 29.7
  29. 12.6
  30. 80
  31. 40.6
  32. 1300
  33. 30
  34. 50
  35. 1100
  36. 20
  37. 56.5
  38. 36000
  39. 69.3
  40. 80

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