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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 627 · 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 896 × 22? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  2. 2.Round 57803 to the nearest ten.
  3. 3.Which is closest to 396 × 21? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  4. 4.Which is closest to 702 × 29? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  5. 5.Round 42822 to the nearest thousand.
  6. 6.Which is closest to 595 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  7. 7.Which is closest to 899 + 697 + 896? (a) 2500 (b) 2700 (c) 2600 (d) 2400
  8. 8.Which is closest to 196 × 48? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  9. 9.Round 76.83 to one decimal place. =
  10. 10.Round 58.16 to one decimal place. =
  11. 11.Which is closest to 802 × 51? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
  12. 12.Which is closest to 1793 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  13. 13.Round 46.08 to one decimal place. =
  14. 14.Which is closest to 803 × 91? (Round each number first.) (a) 144000 (b) 72000 (c) 720000 (d) 7200
  15. 15.Which is closest to 400 + 605 + 795? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  16. 16.Which is closest to 804 × 82? (Round each number first.) (a) 640000 (b) 64000 (c) 128000 (d) 6400
  17. 17.Which is closest to 96 + 502 + 700? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  18. 18.Which is closest to 2792 ÷ 41? (a) 140 (b) 35 (c) 700 (d) 70
  19. 19.Which is closest to 799 + 597 + 700? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  20. 20.Round 90.26 to one decimal place. =
  21. 21.Round 99.08 to one decimal place. =
  22. 22.Which is closest to 696 × 29? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  23. 23.Round 80.67 to one decimal place. =
  24. 24.Which is closest to 3991 ÷ 49? (a) 160 (b) 800 (c) 40 (d) 80
  25. 25.Round 21.67 to one decimal place. =
  26. 26.Which is closest to 702 × 32? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  27. 27.Which is closest to 2496 ÷ 51? (a) 50 (b) 500 (c) 25 (d) 100
  28. 28.Which is closest to 1392 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140
  29. 29.Round 26.36 to one decimal place. =
  30. 30.Round 38.78 to one decimal place. =
  31. 31.Round 45274 to the nearest ten.
  32. 32.Which is closest to 299 × 72? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  33. 33.Which is closest to 4507 ÷ 51? (a) 180 (b) 90 (c) 45 (d) 900
  34. 34.Which is closest to 202 + 297 + 402? (a) 900 (b) 1100 (c) 1000 (d) 800
  35. 35.Round 93.31 to one decimal place. =
  36. 36.Which is closest to 905 + 104 + 95? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  37. 37.Which is closest to 704 + 404 + 196? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  38. 38.Which is closest to 2992 ÷ 49? (a) 30 (b) 60 (c) 600 (d) 120
  39. 39.Which is closest to 302 × 51? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  40. 40.Which is closest to 1196 ÷ 41? (a) 15 (b) 30 (c) 60 (d) 300

Answer key

  1. 18000
  2. 57800
  3. 8000
  4. 21000
  5. 43000
  6. 20
  7. 2500
  8. 10000
  9. 76.8
  10. 58.2
  11. 40000
  12. 90
  13. 46.1
  14. 72000
  15. 1800
  16. 64000
  17. 1300
  18. 70
  19. 2100
  20. 90.3
  21. 99.1
  22. 21000
  23. 80.7
  24. 80
  25. 21.7
  26. 21000
  27. 50
  28. 70
  29. 26.4
  30. 38.8
  31. 45270
  32. 21000
  33. 90
  34. 900
  35. 93.3
  36. 1100
  37. 1300
  38. 60
  39. 15000
  40. 30

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