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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 327 · 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 598 × 40? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  2. 2.Which is closest to 196 + 97 + 200? (a) 600 (b) 700 (c) 400 (d) 500
  3. 3.Round 71384 to the nearest ten.
  4. 4.Which is closest to 901 × 22? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  5. 5.Round 64442 to the nearest thousand.
  6. 6.Round 19.69 to one decimal place. =
  7. 7.Round 70271 to the nearest hundred.
  8. 8.Which is closest to 398 × 30? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  9. 9.Round 16.51 to one decimal place. =
  10. 10.Which is closest to 1403 ÷ 21? (a) 140 (b) 35 (c) 700 (d) 70
  11. 11.Which is closest to 699 + 97 + 704? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  12. 12.Which is closest to 802 × 91? (Round each number first.) (a) 144000 (b) 7200 (c) 720000 (d) 72000
  13. 13.Round 18519 to the nearest hundred.
  14. 14.Which is closest to 596 + 203 + 396? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  15. 15.Which is closest to 297 + 800 + 195? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  16. 16.Which is closest to 303 × 22? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  17. 17.Round 57534 to the nearest thousand.
  18. 18.Which is closest to 791 ÷ 39? (a) 20 (b) 200 (c) 40 (d) 10
  19. 19.Which is closest to 2008 ÷ 39? (a) 50 (b) 100 (c) 25 (d) 500
  20. 20.Which is closest to 1208 ÷ 41? (a) 15 (b) 300 (c) 30 (d) 60
  21. 21.Round 47223 to the nearest ten.
  22. 22.Which is closest to 300 + 104 + 302? (a) 900 (b) 600 (c) 700 (d) 800
  23. 23.Which is closest to 799 × 51? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  24. 24.Which is closest to 1603 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  25. 25.Which is closest to 104 + 797 + 505? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  26. 26.Round 49419 to the nearest thousand.
  27. 27.Round 36.27 to one decimal place. =
  28. 28.Which is closest to 499 + 400 + 705? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  29. 29.Round 42769 to the nearest hundred.
  30. 30.Round 13927 to the nearest ten.
  31. 31.Which is closest to 702 + 298 + 99? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  32. 32.Round 59.77 to one decimal place. =
  33. 33.Which is closest to 200 + 96 + 805? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  34. 34.Which is closest to 803 × 89? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  35. 35.Round 92.57 to one decimal place. =
  36. 36.Which is closest to 801 ÷ 41? (a) 20 (b) 200 (c) 40 (d) 10
  37. 37.Which is closest to 997 ÷ 19? (a) 100 (b) 500 (c) 50 (d) 25
  38. 38.Which is closest to 903 × 78? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
  39. 39.Which is closest to 798 × 88? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  40. 40.Which is closest to 799 × 50? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000

Answer key

  1. 24000
  2. 500
  3. 71380
  4. 18000
  5. 64000
  6. 19.7
  7. 70300
  8. 12000
  9. 16.5
  10. 70
  11. 1500
  12. 72000
  13. 18500
  14. 1200
  15. 1300
  16. 6000
  17. 58000
  18. 20
  19. 50
  20. 30
  21. 47220
  22. 700
  23. 40000
  24. 40
  25. 1400
  26. 49000
  27. 36.3
  28. 1600
  29. 42800
  30. 13930
  31. 1100
  32. 59.8
  33. 1100
  34. 72000
  35. 92.6
  36. 20
  37. 50
  38. 72000
  39. 72000
  40. 40000

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