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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 183 · 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 97 + 95 + 202? (a) 400 (b) 600 (c) 500 (d) 300
  2. 2.Which is closest to 1203 ÷ 41? (a) 60 (b) 30 (c) 15 (d) 300
  3. 3.Round 34514 to the nearest ten.
  4. 4.Which is closest to 196 × 91? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  5. 5.Round 85489 to the nearest hundred.
  6. 6.Round 78568 to the nearest ten.
  7. 7.Round 71.39 to one decimal place. =
  8. 8.Which is closest to 598 × 82? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  9. 9.Round 94.67 to one decimal place. =
  10. 10.Which is closest to 102 + 499 + 96? (a) 900 (b) 800 (c) 700 (d) 600
  11. 11.Which is closest to 600 × 72? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  12. 12.Which is closest to 500 + 198 + 98? (a) 1000 (b) 800 (c) 700 (d) 900
  13. 13.Round 86.12 to one decimal place. =
  14. 14.Which is closest to 2400 ÷ 31? (a) 160 (b) 80 (c) 800 (d) 40
  15. 15.Which is closest to 699 × 28? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  16. 16.Which is closest to 1495 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  17. 17.Which is closest to 602 × 22? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  18. 18.Which is closest to 502 + 498 + 300? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  19. 19.Round 80.94 to one decimal place. =
  20. 20.Which is closest to 304 × 80? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  21. 21.Which is closest to 603 × 51? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  22. 22.Which is closest to 800 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  23. 23.Round 99.46 to one decimal place. =
  24. 24.Which is closest to 400 × 18? (Round each number first.) (a) 8000 (b) 800 (c) 16000 (d) 80000
  25. 25.Round 24481 to the nearest ten.
  26. 26.Round 11864 to the nearest hundred.
  27. 27.Which is closest to 99 + 797 + 297? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  28. 28.Which is closest to 1991 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  29. 29.Which is closest to 2501 ÷ 49? (a) 100 (b) 500 (c) 50 (d) 25
  30. 30.Round 8653 to the nearest thousand.
  31. 31.Which is closest to 802 + 799 + 701? (a) 2200 (b) 2300 (c) 2400 (d) 2500
  32. 32.Which is closest to 1491 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  33. 33.Round 71416 to the nearest ten.
  34. 34.Round 11958 to the nearest hundred.
  35. 35.Round 9862 to the nearest hundred.
  36. 36.Which is closest to 499 × 72? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  37. 37.Round 59.63 to one decimal place. =
  38. 38.Round 69438 to the nearest thousand.
  39. 39.Round 86.34 to one decimal place. =
  40. 40.Which is closest to 799 × 28? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000

Answer key

  1. 400
  2. 30
  3. 34510
  4. 18000
  5. 85500
  6. 78570
  7. 71.4
  8. 48000
  9. 94.7
  10. 700
  11. 42000
  12. 800
  13. 86.1
  14. 80
  15. 21000
  16. 30
  17. 12000
  18. 1300
  19. 80.9
  20. 24000
  21. 30000
  22. 32000
  23. 99.5
  24. 8000
  25. 24480
  26. 11900
  27. 1200
  28. 40
  29. 50
  30. 9000
  31. 2300
  32. 30
  33. 71420
  34. 12000
  35. 9900
  36. 35000
  37. 59.6
  38. 69000
  39. 86.3
  40. 24000

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