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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 75 · 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 70072 to the nearest ten.
  2. 2.Round 35.86 to one decimal place. =
  3. 3.Which is closest to 797 + 501 + 900? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  4. 4.Round 57.46 to one decimal place. =
  5. 5.Round 96566 to the nearest ten.
  6. 6.Round 50.31 to one decimal place. =
  7. 7.Which is closest to 1006 ÷ 49? (a) 200 (b) 40 (c) 10 (d) 20
  8. 8.Round 1551 to the nearest thousand.
  9. 9.Round 32.67 to one decimal place. =
  10. 10.Which is closest to 204 × 89? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  11. 11.Which is closest to 298 × 28? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  12. 12.Which is closest to 591 ÷ 19? (a) 60 (b) 30 (c) 15 (d) 300
  13. 13.Which is closest to 301 + 499 + 203? (a) 1000 (b) 1100 (c) 900 (d) 1200
  14. 14.Round 20.52 to one decimal place. =
  15. 15.Which is closest to 597 × 58? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  16. 16.Round 71.23 to one decimal place. =
  17. 17.Round 29.63 to one decimal place. =
  18. 18.Which is closest to 504 × 89? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  19. 19.Round 16.58 to one decimal place. =
  20. 20.Which is closest to 2698 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  21. 21.Which is closest to 1398 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140
  22. 22.Which is closest to 800 × 19? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  23. 23.Round 94.12 to one decimal place. =
  24. 24.Which is closest to 595 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  25. 25.Which is closest to 602 × 38? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  26. 26.Which is closest to 901 + 296 + 195? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  27. 27.Which is closest to 902 × 80? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  28. 28.Which is closest to 105 + 202 + 97? (a) 400 (b) 300 (c) 500 (d) 600
  29. 29.Which is closest to 2402 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  30. 30.Which is closest to 1798 ÷ 31? (a) 60 (b) 120 (c) 30 (d) 600
  31. 31.Which is closest to 404 + 601 + 702? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  32. 32.Round 10.21 to one decimal place. =
  33. 33.Round 13.22 to one decimal place. =
  34. 34.Which is closest to 103 + 197 + 804? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  35. 35.Round 42.06 to one decimal place. =
  36. 36.Round 64.54 to one decimal place. =
  37. 37.Which is closest to 202 × 52? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  38. 38.Which is closest to 598 × 79? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  39. 39.Which is closest to 104 + 101 + 99? (a) 200 (b) 400 (c) 500 (d) 300
  40. 40.Round 18.08 to one decimal place. =

Answer key

  1. 70070
  2. 35.9
  3. 2200
  4. 57.5
  5. 96570
  6. 50.3
  7. 20
  8. 2000
  9. 32.7
  10. 18000
  11. 9000
  12. 30
  13. 1000
  14. 20.5
  15. 36000
  16. 71.2
  17. 29.6
  18. 45000
  19. 16.6
  20. 90
  21. 70
  22. 16000
  23. 94.1
  24. 30
  25. 24000
  26. 1400
  27. 72000
  28. 400
  29. 80
  30. 60
  31. 1700
  32. 10.2
  33. 13.2
  34. 1100
  35. 42.1
  36. 64.5
  37. 10000
  38. 48000
  39. 300
  40. 18.1

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