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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 862 · 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 802 × 68? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  2. 2.Which is closest to 901 + 405 + 595? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  3. 3.Which is closest to 302 × 42? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  4. 4.Round 18129 to the nearest ten.
  5. 5.Which is closest to 1208 ÷ 31? (a) 40 (b) 20 (c) 400 (d) 80
  6. 6.Round 87.52 to one decimal place. =
  7. 7.Which is closest to 102 + 296 + 600? (a) 1100 (b) 1000 (c) 900 (d) 1200
  8. 8.Round 76.54 to one decimal place. =
  9. 9.Which is closest to 403 + 799 + 198? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  10. 10.Which is closest to 1593 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  11. 11.Which is closest to 700 × 68? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  12. 12.Which is closest to 1498 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  13. 13.Round 73.34 to one decimal place. =
  14. 14.Round 42.89 to one decimal place. =
  15. 15.Round 63.76 to one decimal place. =
  16. 16.Which is closest to 1405 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  17. 17.Which is closest to 897 × 80? (Round each number first.) (a) 720000 (b) 72000 (c) 144000 (d) 7200
  18. 18.Which is closest to 897 × 52? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  19. 19.Which is closest to 591 ÷ 21? (a) 15 (b) 300 (c) 60 (d) 30
  20. 20.Which is closest to 205 + 196 + 495? (a) 1000 (b) 1100 (c) 900 (d) 800
  21. 21.Round 9428 to the nearest hundred.
  22. 22.Round 53.12 to one decimal place. =
  23. 23.Which is closest to 3604 ÷ 39? (a) 90 (b) 900 (c) 180 (d) 45
  24. 24.Which is closest to 798 × 49? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  25. 25.Round 34.39 to one decimal place. =
  26. 26.Round 62.19 to one decimal place. =
  27. 27.Which is closest to 200 × 88? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  28. 28.Which is closest to 105 + 95 + 903? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  29. 29.Round 62.27 to one decimal place. =
  30. 30.Round 18.42 to one decimal place. =
  31. 31.Which is closest to 597 ÷ 21? (a) 60 (b) 30 (c) 15 (d) 300
  32. 32.Which is closest to 2502 ÷ 49? (a) 500 (b) 25 (c) 100 (d) 50
  33. 33.Which is closest to 1200 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  34. 34.Round 80.72 to one decimal place. =
  35. 35.Which is closest to 1207 ÷ 19? (a) 30 (b) 120 (c) 600 (d) 60
  36. 36.Which is closest to 701 + 105 + 396? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  37. 37.Round 39351 to the nearest thousand.
  38. 38.Which is closest to 1009 ÷ 49? (a) 10 (b) 20 (c) 200 (d) 40
  39. 39.Which is closest to 695 + 95 + 597? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  40. 40.Which is closest to 798 × 30? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000

Answer key

  1. 56000
  2. 1900
  3. 12000
  4. 18130
  5. 40
  6. 87.5
  7. 1000
  8. 76.5
  9. 1400
  10. 40
  11. 49000
  12. 30
  13. 73.3
  14. 42.9
  15. 63.8
  16. 70
  17. 72000
  18. 45000
  19. 30
  20. 900
  21. 9400
  22. 53.1
  23. 90
  24. 40000
  25. 34.4
  26. 62.2
  27. 18000
  28. 1100
  29. 62.3
  30. 18.4
  31. 30
  32. 50
  33. 60
  34. 80.7
  35. 60
  36. 1200
  37. 39000
  38. 20
  39. 1400
  40. 24000

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