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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 889 · 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.Round 9589 to the nearest ten.
  2. 2.Which is closest to 700 + 403 + 99? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  3. 3.Which is closest to 603 ÷ 19? (a) 15 (b) 300 (c) 30 (d) 60
  4. 4.Which is closest to 798 × 80? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  5. 5.Which is closest to 1195 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  6. 6.Which is closest to 802 + 205 + 898? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  7. 7.Round 10.74 to one decimal place. =
  8. 8.Round 38996 to the nearest thousand.
  9. 9.Which is closest to 3999 ÷ 51? (a) 40 (b) 800 (c) 80 (d) 160
  10. 10.Round 92232 to the nearest hundred.
  11. 11.Which is closest to 2395 ÷ 29? (a) 40 (b) 80 (c) 800 (d) 160
  12. 12.Which is closest to 98 + 205 + 698? (a) 1000 (b) 1200 (c) 1100 (d) 900
  13. 13.Round 71.14 to one decimal place. =
  14. 14.Which is closest to 2796 ÷ 39? (a) 700 (b) 140 (c) 70 (d) 35
  15. 15.Which is closest to 3606 ÷ 41? (a) 180 (b) 45 (c) 90 (d) 900
  16. 16.Round 10134 to the nearest ten.
  17. 17.Which is closest to 596 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  18. 18.Which is closest to 402 × 20? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  19. 19.Round 15.51 to one decimal place. =
  20. 20.Round 36.36 to one decimal place. =
  21. 21.Round 82238 to the nearest thousand.
  22. 22.Round 90.31 to one decimal place. =
  23. 23.Which is closest to 2502 ÷ 51? (a) 50 (b) 500 (c) 100 (d) 25
  24. 24.Which is closest to 804 × 59? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
  25. 25.Which is closest to 400 + 198 + 798? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  26. 26.Which is closest to 893 ÷ 29? (a) 30 (b) 15 (c) 60 (d) 300
  27. 27.Which is closest to 95 + 701 + 800? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  28. 28.Which is closest to 297 × 80? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  29. 29.Which is closest to 497 × 32? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  30. 30.Which is closest to 900 × 69? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  31. 31.Which is closest to 105 + 596 + 705? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  32. 32.Which is closest to 900 × 88? (Round each number first.) (a) 8100 (b) 81000 (c) 162000 (d) 810000
  33. 33.Which is closest to 197 + 700 + 105? (a) 900 (b) 1200 (c) 1100 (d) 1000
  34. 34.Round 5372 to the nearest ten.
  35. 35.Which is closest to 199 + 296 + 897? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  36. 36.Round 15516 to the nearest thousand.
  37. 37.Round 96.89 to one decimal place. =
  38. 38.Round 26.22 to one decimal place. =
  39. 39.Round 2983 to the nearest ten.
  40. 40.Which is closest to 1606 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400

Answer key

  1. 9590
  2. 1200
  3. 30
  4. 64000
  5. 60
  6. 1900
  7. 10.7
  8. 39000
  9. 80
  10. 92200
  11. 80
  12. 1000
  13. 71.1
  14. 70
  15. 90
  16. 10130
  17. 30
  18. 8000
  19. 15.5
  20. 36.4
  21. 82000
  22. 90.3
  23. 50
  24. 48000
  25. 1400
  26. 30
  27. 1600
  28. 24000
  29. 15000
  30. 63000
  31. 1400
  32. 81000
  33. 1000
  34. 5370
  35. 1400
  36. 16000
  37. 96.9
  38. 26.2
  39. 2980
  40. 40

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