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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 357 · 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 3195 ÷ 39? (a) 40 (b) 160 (c) 800 (d) 80
  2. 2.Round 39161 to the nearest hundred.
  3. 3.Round 27906 to the nearest thousand.
  4. 4.Which is closest to 599 ÷ 31? (a) 40 (b) 20 (c) 10 (d) 200
  5. 5.Round 19.18 to one decimal place. =
  6. 6.Which is closest to 1200 ÷ 21? (a) 600 (b) 30 (c) 60 (d) 120
  7. 7.Round 50608 to the nearest ten.
  8. 8.Which is closest to 702 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  9. 9.Round 24.36 to one decimal place. =
  10. 10.Which is closest to 696 + 100 + 696? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  11. 11.Which is closest to 296 × 40? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  12. 12.Which is closest to 802 × 41? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  13. 13.Which is closest to 699 + 200 + 900? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  14. 14.Which is closest to 595 + 497 + 202? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  15. 15.Round 20246 to the nearest thousand.
  16. 16.Which is closest to 3203 ÷ 41? (a) 160 (b) 800 (c) 40 (d) 80
  17. 17.Which is closest to 396 × 29? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  18. 18.Which is closest to 900 + 296 + 303? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  19. 19.Which is closest to 895 + 195 + 700? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  20. 20.Which is closest to 299 × 42? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  21. 21.Which is closest to 395 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  22. 22.Round 95.37 to one decimal place. =
  23. 23.Which is closest to 205 + 204 + 297? (a) 700 (b) 900 (c) 600 (d) 800
  24. 24.Round 43837 to the nearest ten.
  25. 25.Which is closest to 897 × 79? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  26. 26.Which is closest to 399 × 40? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  27. 27.Round 80370 to the nearest thousand.
  28. 28.Round 16.07 to one decimal place. =
  29. 29.Round 22398 to the nearest hundred.
  30. 30.Round 26095 to the nearest hundred.
  31. 31.Which is closest to 897 × 71? (Round each number first.) (a) 630000 (b) 63000 (c) 126000 (d) 6300
  32. 32.Round 95.13 to one decimal place. =
  33. 33.Which is closest to 2508 ÷ 49? (a) 25 (b) 50 (c) 100 (d) 500
  34. 34.Round 72539 to the nearest hundred.
  35. 35.Which is closest to 3000 ÷ 51? (a) 60 (b) 600 (c) 120 (d) 30
  36. 36.Round 55.22 to one decimal place. =
  37. 37.Which is closest to 2401 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  38. 38.Which is closest to 500 × 89? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  39. 39.Which is closest to 902 + 897 + 899? (a) 2600 (b) 2700 (c) 2900 (d) 2800
  40. 40.Which is closest to 791 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400

Answer key

  1. 80
  2. 39200
  3. 28000
  4. 20
  5. 19.2
  6. 60
  7. 50610
  8. 21000
  9. 24.4
  10. 1500
  11. 12000
  12. 32000
  13. 1800
  14. 1300
  15. 20000
  16. 80
  17. 12000
  18. 1500
  19. 1800
  20. 12000
  21. 20
  22. 95.4
  23. 700
  24. 43840
  25. 72000
  26. 16000
  27. 80000
  28. 16.1
  29. 22400
  30. 26100
  31. 63000
  32. 95.1
  33. 50
  34. 72500
  35. 60
  36. 55.2
  37. 80
  38. 45000
  39. 2700
  40. 40

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