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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 711 · 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 100 + 99 + 605? (a) 1000 (b) 800 (c) 900 (d) 700
  2. 2.Round 32729 to the nearest hundred.
  3. 3.Which is closest to 802 × 80? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  4. 4.Which is closest to 397 + 97 + 100? (a) 800 (b) 700 (c) 600 (d) 500
  5. 5.Which is closest to 1602 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  6. 6.Round 74397 to the nearest hundred.
  7. 7.Round 35264 to the nearest ten.
  8. 8.Which is closest to 2796 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  9. 9.Which is closest to 1799 ÷ 29? (a) 60 (b) 600 (c) 30 (d) 120
  10. 10.Which is closest to 2008 ÷ 51? (a) 20 (b) 400 (c) 80 (d) 40
  11. 11.Which is closest to 2397 ÷ 39? (a) 60 (b) 30 (c) 120 (d) 600
  12. 12.Which is closest to 201 × 71? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  13. 13.Which is closest to 105 + 697 + 499? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  14. 14.Which is closest to 404 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  15. 15.Round 48.66 to one decimal place. =
  16. 16.Which is closest to 3997 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  17. 17.Round 99.34 to one decimal place. =
  18. 18.Which is closest to 2003 ÷ 51? (a) 80 (b) 40 (c) 20 (d) 400
  19. 19.Which is closest to 698 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  20. 20.Round 35.49 to one decimal place. =
  21. 21.Which is closest to 808 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  22. 22.Which is closest to 1200 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
  23. 23.Which is closest to 897 × 81? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  24. 24.Which is closest to 95 + 95 + 199? (a) 500 (b) 300 (c) 600 (d) 400
  25. 25.Round 68426 to the nearest ten.
  26. 26.Which is closest to 1409 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  27. 27.Which is closest to 598 × 48? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  28. 28.Round 10163 to the nearest ten.
  29. 29.Which is closest to 1193 ÷ 31? (a) 80 (b) 400 (c) 40 (d) 20
  30. 30.Which is closest to 592 ÷ 29? (a) 40 (b) 20 (c) 200 (d) 10
  31. 31.Which is closest to 903 + 802 + 496? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  32. 32.Which is closest to 501 × 29? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  33. 33.Which is closest to 800 ÷ 19? (a) 20 (b) 400 (c) 40 (d) 80
  34. 34.Which is closest to 1492 ÷ 31? (a) 500 (b) 100 (c) 50 (d) 25
  35. 35.Which is closest to 296 + 195 + 503? (a) 1100 (b) 1200 (c) 900 (d) 1000
  36. 36.Round 41.89 to one decimal place. =
  37. 37.Which is closest to 1203 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
  38. 38.Which is closest to 803 × 52? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  39. 39.Which is closest to 991 ÷ 49? (a) 10 (b) 20 (c) 200 (d) 40
  40. 40.Which is closest to 3494 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70

Answer key

  1. 800
  2. 32700
  3. 64000
  4. 600
  5. 80
  6. 74400
  7. 35260
  8. 70
  9. 60
  10. 40
  11. 60
  12. 14000
  13. 1300
  14. 12000
  15. 48.7
  16. 80
  17. 99.3
  18. 40
  19. 14000
  20. 35.5
  21. 20
  22. 30
  23. 72000
  24. 400
  25. 68430
  26. 70
  27. 30000
  28. 10160
  29. 40
  30. 20
  31. 2200
  32. 15000
  33. 40
  34. 50
  35. 1000
  36. 41.9
  37. 60
  38. 40000
  39. 20
  40. 70

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