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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 615 · 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 1602 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  2. 2.Which is closest to 1200 ÷ 31? (a) 400 (b) 20 (c) 80 (d) 40
  3. 3.Round 59.93 to one decimal place. =
  4. 4.Round 73352 to the nearest thousand.
  5. 5.Which is closest to 496 × 29? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  6. 6.Round 81111 to the nearest thousand.
  7. 7.Round 9071 to the nearest ten.
  8. 8.Round 24183 to the nearest hundred.
  9. 9.Which is closest to 500 × 29? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  10. 10.Round 67267 to the nearest hundred.
  11. 11.Which is closest to 204 × 38? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  12. 12.Round 35.09 to one decimal place. =
  13. 13.Which is closest to 696 + 301 + 698? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  14. 14.Round 56564 to the nearest ten.
  15. 15.Round 47.86 to one decimal place. =
  16. 16.Round 44.57 to one decimal place. =
  17. 17.Which is closest to 596 + 99 + 696? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  18. 18.Round 31506 to the nearest hundred.
  19. 19.Round 47299 to the nearest ten.
  20. 20.Round 16740 to the nearest hundred.
  21. 21.Which is closest to 399 × 80? (Round each number first.) (a) 320000 (b) 32000 (c) 3200 (d) 64000
  22. 22.Which is closest to 1992 ÷ 39? (a) 500 (b) 50 (c) 25 (d) 100
  23. 23.Which is closest to 1603 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
  24. 24.Round 9019 to the nearest hundred.
  25. 25.Round 59.84 to one decimal place. =
  26. 26.Which is closest to 202 + 403 + 205? (a) 1000 (b) 900 (c) 700 (d) 800
  27. 27.Round 16.11 to one decimal place. =
  28. 28.Which is closest to 805 ÷ 41? (a) 200 (b) 40 (c) 10 (d) 20
  29. 29.Round 74441 to the nearest ten.
  30. 30.Which is closest to 599 + 96 + 195? (a) 800 (b) 1100 (c) 1000 (d) 900
  31. 31.Which is closest to 1400 ÷ 21? (a) 35 (b) 140 (c) 700 (d) 70
  32. 32.Which is closest to 601 + 402 + 502? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  33. 33.Which is closest to 1195 ÷ 19? (a) 30 (b) 60 (c) 120 (d) 600
  34. 34.Round 36.87 to one decimal place. =
  35. 35.Round 44271 to the nearest ten.
  36. 36.Which is closest to 808 ÷ 41? (a) 200 (b) 10 (c) 40 (d) 20
  37. 37.Round 49.43 to one decimal place. =
  38. 38.Which is closest to 898 + 796 + 896? (a) 2700 (b) 2800 (c) 2500 (d) 2600
  39. 39.Which is closest to 297 × 58? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  40. 40.Round 81066 to the nearest ten.

Answer key

  1. 40
  2. 40
  3. 59.9
  4. 73000
  5. 15000
  6. 81000
  7. 9070
  8. 24200
  9. 15000
  10. 67300
  11. 8000
  12. 35.1
  13. 1700
  14. 56560
  15. 47.9
  16. 44.6
  17. 1400
  18. 31500
  19. 47300
  20. 16700
  21. 32000
  22. 50
  23. 40
  24. 9000
  25. 59.8
  26. 800
  27. 16.1
  28. 20
  29. 74440
  30. 900
  31. 70
  32. 1500
  33. 60
  34. 36.9
  35. 44270
  36. 20
  37. 49.4
  38. 2600
  39. 18000
  40. 81070

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