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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 684 · 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 497 × 51? (Round each number first.) (a) 25000 (b) 2500 (c) 50000 (d) 250000
  2. 2.Which is closest to 501 × 22? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  3. 3.Which is closest to 798 × 90? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
  4. 4.Which is closest to 3192 ÷ 39? (a) 40 (b) 160 (c) 80 (d) 800
  5. 5.Which is closest to 2107 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
  6. 6.Which is closest to 1792 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  7. 7.Which is closest to 498 + 497 + 501? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  8. 8.Round 80023 to the nearest hundred.
  9. 9.Round 43901 to the nearest hundred.
  10. 10.Round 62.94 to one decimal place. =
  11. 11.Which is closest to 696 × 78? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  12. 12.Round 57878 to the nearest thousand.
  13. 13.Round 23446 to the nearest hundred.
  14. 14.Which is closest to 304 × 32? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  15. 15.Which is closest to 3196 ÷ 41? (a) 40 (b) 800 (c) 160 (d) 80
  16. 16.Round 35230 to the nearest thousand.
  17. 17.Which is closest to 2100 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Which is closest to 899 + 104 + 900? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  19. 19.Which is closest to 1007 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  20. 20.Round 89.64 to one decimal place. =
  21. 21.Which is closest to 705 + 698 + 899? (a) 2200 (b) 2400 (c) 2500 (d) 2300
  22. 22.Which is closest to 298 + 404 + 196? (a) 1000 (b) 1100 (c) 800 (d) 900
  23. 23.Which is closest to 704 × 81? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  24. 24.Round 53022 to the nearest ten.
  25. 25.Which is closest to 1802 ÷ 19? (a) 180 (b) 90 (c) 900 (d) 45
  26. 26.Which is closest to 196 + 504 + 805? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  27. 27.Round 92395 to the nearest hundred.
  28. 28.Round 97020 to the nearest thousand.
  29. 29.Which is closest to 498 + 899 + 604? (a) 1900 (b) 2200 (c) 2000 (d) 2100
  30. 30.Round 34457 to the nearest hundred.
  31. 31.Round 96.77 to one decimal place. =
  32. 32.Which is closest to 2101 ÷ 31? (a) 35 (b) 140 (c) 700 (d) 70
  33. 33.Round 92574 to the nearest ten.
  34. 34.Round 54.34 to one decimal place. =
  35. 35.Round 9210 to the nearest hundred.
  36. 36.Which is closest to 301 × 29? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  37. 37.Which is closest to 198 × 90? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  38. 38.Which is closest to 503 × 38? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  39. 39.Which is closest to 597 ÷ 19? (a) 30 (b) 300 (c) 60 (d) 15
  40. 40.Round 1809 to the nearest hundred.

Answer key

  1. 25000
  2. 10000
  3. 72000
  4. 80
  5. 70
  6. 90
  7. 1500
  8. 80000
  9. 43900
  10. 62.9
  11. 56000
  12. 58000
  13. 23400
  14. 9000
  15. 80
  16. 35000
  17. 70
  18. 1900
  19. 20
  20. 89.6
  21. 2300
  22. 900
  23. 56000
  24. 53020
  25. 90
  26. 1500
  27. 92400
  28. 97000
  29. 2000
  30. 34500
  31. 96.8
  32. 70
  33. 92570
  34. 54.3
  35. 9200
  36. 9000
  37. 18000
  38. 20000
  39. 30
  40. 1800

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