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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 902 · 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 295 + 502 + 302? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  2. 2.Round 88413 to the nearest hundred.
  3. 3.Which is closest to 101 + 601 + 297? (a) 1100 (b) 1000 (c) 900 (d) 1200
  4. 4.Which is closest to 98 + 700 + 495? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  5. 5.Which is closest to 3500 ÷ 49? (a) 140 (b) 700 (c) 70 (d) 35
  6. 6.Which is closest to 198 + 199 + 799? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  7. 7.Round 2877 to the nearest ten.
  8. 8.Which is closest to 402 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40
  9. 9.Which is closest to 301 × 51? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  10. 10.Which is closest to 806 ÷ 39? (a) 40 (b) 10 (c) 200 (d) 20
  11. 11.Round 22.32 to one decimal place. =
  12. 12.Round 67277 to the nearest thousand.
  13. 13.Round 43.86 to one decimal place. =
  14. 14.Which is closest to 398 × 29? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  15. 15.Round 4387 to the nearest thousand.
  16. 16.Which is closest to 3993 ÷ 51? (a) 40 (b) 160 (c) 80 (d) 800
  17. 17.Round 93607 to the nearest hundred.
  18. 18.Which is closest to 1499 ÷ 49? (a) 15 (b) 30 (c) 300 (d) 60
  19. 19.Which is closest to 3500 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  20. 20.Round 71.42 to one decimal place. =
  21. 21.Which is closest to 1497 ÷ 31? (a) 50 (b) 500 (c) 25 (d) 100
  22. 22.Which is closest to 996 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  23. 23.Round 93.86 to one decimal place. =
  24. 24.Which is closest to 599 + 299 + 199? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  25. 25.Round 5716 to the nearest ten.
  26. 26.Round 6643 to the nearest thousand.
  27. 27.Round 16666 to the nearest thousand.
  28. 28.Which is closest to 3998 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
  29. 29.Which is closest to 499 × 29? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  30. 30.Which is closest to 298 × 61? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  31. 31.Round 74.71 to one decimal place. =
  32. 32.Round 85.09 to one decimal place. =
  33. 33.Which is closest to 199 × 68? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  34. 34.Round 87587 to the nearest ten.
  35. 35.Which is closest to 295 + 602 + 696? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  36. 36.Which is closest to 503 × 78? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  37. 37.Round 17.47 to one decimal place. =
  38. 38.Which is closest to 297 × 30? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  39. 39.Round 43.42 to one decimal place. =
  40. 40.Round 47.08 to one decimal place. =

Answer key

  1. 1100
  2. 88400
  3. 1000
  4. 1300
  5. 70
  6. 1200
  7. 2880
  8. 20
  9. 15000
  10. 20
  11. 22.3
  12. 67000
  13. 43.9
  14. 12000
  15. 4000
  16. 80
  17. 93600
  18. 30
  19. 70
  20. 71.4
  21. 50
  22. 20
  23. 93.9
  24. 1100
  25. 5720
  26. 7000
  27. 17000
  28. 80
  29. 15000
  30. 18000
  31. 74.7
  32. 85.1
  33. 14000
  34. 87590
  35. 1600
  36. 40000
  37. 17.5
  38. 9000
  39. 43.4
  40. 47.1

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