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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 688 · 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 199 × 22? (Round each number first.) (a) 40000 (b) 4000 (c) 8000 (d) 400
  2. 2.Round 70241 to the nearest ten.
  3. 3.Which is closest to 4495 ÷ 51? (a) 180 (b) 900 (c) 90 (d) 45
  4. 4.Round 76184 to the nearest thousand.
  5. 5.Which is closest to 1993 ÷ 39? (a) 500 (b) 25 (c) 100 (d) 50
  6. 6.Which is closest to 397 + 200 + 405? (a) 1200 (b) 1000 (c) 1100 (d) 900
  7. 7.Round 3626 to the nearest hundred.
  8. 8.Which is closest to 4496 ÷ 51? (a) 45 (b) 180 (c) 90 (d) 900
  9. 9.Round 11578 to the nearest hundred.
  10. 10.Which is closest to 3007 ÷ 51? (a) 600 (b) 30 (c) 120 (d) 60
  11. 11.Which is closest to 594 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  12. 12.Round 17.61 to one decimal place. =
  13. 13.Which is closest to 495 + 300 + 696? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  14. 14.Which is closest to 896 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  15. 15.Which is closest to 697 + 798 + 505? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  16. 16.Round 48506 to the nearest hundred.
  17. 17.Round 82.86 to one decimal place. =
  18. 18.Round 39413 to the nearest thousand.
  19. 19.Which is closest to 599 × 89? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  20. 20.Round 54.92 to one decimal place. =
  21. 21.Round 76.12 to one decimal place. =
  22. 22.Which is closest to 798 × 49? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  23. 23.Which is closest to 800 × 39? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  24. 24.Round 67671 to the nearest thousand.
  25. 25.Round 73.42 to one decimal place. =
  26. 26.Round 67.58 to one decimal place. =
  27. 27.Round 63174 to the nearest thousand.
  28. 28.Which is closest to 901 × 28? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  29. 29.Which is closest to 700 + 97 + 603? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  30. 30.Round 44.88 to one decimal place. =
  31. 31.Which is closest to 195 + 201 + 902? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  32. 32.Which is closest to 595 + 896 + 700? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  33. 33.Round 67.57 to one decimal place. =
  34. 34.Which is closest to 2704 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  35. 35.Which is closest to 1192 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  36. 36.Which is closest to 3597 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  37. 37.Which is closest to 1394 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  38. 38.Which is closest to 396 + 305 + 501? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  39. 39.Which is closest to 396 × 92? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  40. 40.Which is closest to 196 × 31? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000

Answer key

  1. 4000
  2. 70240
  3. 90
  4. 76000
  5. 50
  6. 1000
  7. 3600
  8. 90
  9. 11600
  10. 60
  11. 30
  12. 17.6
  13. 1500
  14. 30
  15. 2000
  16. 48500
  17. 82.9
  18. 39000
  19. 54000
  20. 54.9
  21. 76.1
  22. 40000
  23. 32000
  24. 68000
  25. 73.4
  26. 67.6
  27. 63000
  28. 27000
  29. 1400
  30. 44.9
  31. 1300
  32. 2200
  33. 67.6
  34. 90
  35. 30
  36. 90
  37. 70
  38. 1200
  39. 36000
  40. 6000

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