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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 941 · 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 803 × 19? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  2. 2.Which is closest to 199 × 79? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  3. 3.Which is closest to 396 + 296 + 297? (a) 1100 (b) 1000 (c) 900 (d) 1200
  4. 4.Which is closest to 899 × 70? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  5. 5.Which is closest to 1201 ÷ 41? (a) 15 (b) 60 (c) 300 (d) 30
  6. 6.Round 50241 to the nearest ten.
  7. 7.Which is closest to 1601 ÷ 41? (a) 20 (b) 80 (c) 40 (d) 400
  8. 8.Round 26261 to the nearest hundred.
  9. 9.Which is closest to 195 + 395 + 401? (a) 1000 (b) 900 (c) 1200 (d) 1100
  10. 10.Which is closest to 298 × 22? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  11. 11.Which is closest to 302 × 50? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  12. 12.Round 65.32 to one decimal place. =
  13. 13.Which is closest to 599 + 897 + 505? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  14. 14.Round 58.64 to one decimal place. =
  15. 15.Which is closest to 1509 ÷ 29? (a) 25 (b) 50 (c) 500 (d) 100
  16. 16.Round 16.31 to one decimal place. =
  17. 17.Which is closest to 299 × 29? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  18. 18.Which is closest to 96 + 895 + 901? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  19. 19.Which is closest to 105 + 498 + 700? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  20. 20.Round 47.18 to one decimal place. =
  21. 21.Round 64.16 to one decimal place. =
  22. 22.Round 40931 to the nearest thousand.
  23. 23.Which is closest to 1208 ÷ 39? (a) 60 (b) 15 (c) 300 (d) 30
  24. 24.Which is closest to 596 × 20? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  25. 25.Which is closest to 95 + 98 + 895? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  26. 26.Which is closest to 3000 ÷ 51? (a) 30 (b) 600 (c) 60 (d) 120
  27. 27.Round 63.17 to one decimal place. =
  28. 28.Round 82758 to the nearest ten.
  29. 29.Which is closest to 2095 ÷ 31? (a) 700 (b) 35 (c) 140 (d) 70
  30. 30.Which is closest to 2999 ÷ 49? (a) 600 (b) 30 (c) 120 (d) 60
  31. 31.Which is closest to 2701 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  32. 32.Which is closest to 497 + 303 + 495? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  33. 33.Which is closest to 3606 ÷ 39? (a) 900 (b) 90 (c) 45 (d) 180
  34. 34.Which is closest to 502 × 20? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  35. 35.Which is closest to 796 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  36. 36.Round 74181 to the nearest ten.
  37. 37.Round 1519 to the nearest hundred.
  38. 38.Which is closest to 95 + 803 + 105? (a) 1100 (b) 1000 (c) 1200 (d) 900
  39. 39.Round 56631 to the nearest ten.
  40. 40.Which is closest to 196 × 22? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000

Answer key

  1. 16000
  2. 16000
  3. 1000
  4. 63000
  5. 30
  6. 50240
  7. 40
  8. 26300
  9. 1000
  10. 6000
  11. 15000
  12. 65.3
  13. 2000
  14. 58.6
  15. 50
  16. 16.3
  17. 9000
  18. 1900
  19. 1300
  20. 47.2
  21. 64.2
  22. 41000
  23. 30
  24. 12000
  25. 1100
  26. 60
  27. 63.2
  28. 82760
  29. 70
  30. 60
  31. 90
  32. 1300
  33. 90
  34. 10000
  35. 24000
  36. 74180
  37. 1500
  38. 1000
  39. 56630
  40. 4000

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