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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 597 · 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 99282 to the nearest ten.
  2. 2.Round 30113 to the nearest hundred.
  3. 3.Round 37733 to the nearest thousand.
  4. 4.Round 61.57 to one decimal place. =
  5. 5.Round 51.37 to one decimal place. =
  6. 6.Which is closest to 1806 ÷ 19? (a) 45 (b) 90 (c) 180 (d) 900
  7. 7.Round 14.41 to one decimal place. =
  8. 8.Round 66.14 to one decimal place. =
  9. 9.Which is closest to 3204 ÷ 41? (a) 40 (b) 80 (c) 800 (d) 160
  10. 10.Round 51.84 to one decimal place. =
  11. 11.Round 95321 to the nearest ten.
  12. 12.Which is closest to 4494 ÷ 49? (a) 180 (b) 45 (c) 900 (d) 90
  13. 13.Which is closest to 2098 ÷ 29? (a) 70 (b) 35 (c) 140 (d) 700
  14. 14.Which is closest to 300 × 88? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  15. 15.Which is closest to 803 × 32? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  16. 16.Which is closest to 697 + 597 + 705? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  17. 17.Which is closest to 699 × 61? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
  18. 18.Which is closest to 395 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  19. 19.Which is closest to 299 × 70? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  20. 20.Round 26.58 to one decimal place. =
  21. 21.Which is closest to 1600 ÷ 19? (a) 40 (b) 80 (c) 160 (d) 800
  22. 22.Which is closest to 2508 ÷ 51? (a) 25 (b) 100 (c) 50 (d) 500
  23. 23.Which is closest to 201 × 88? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  24. 24.Which is closest to 992 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  25. 25.Which is closest to 98 + 201 + 702? (a) 1000 (b) 1200 (c) 1100 (d) 900
  26. 26.Which is closest to 1507 ÷ 51? (a) 300 (b) 15 (c) 60 (d) 30
  27. 27.Which is closest to 798 × 22? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  28. 28.Which is closest to 603 × 30? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  29. 29.Which is closest to 803 × 41? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  30. 30.Which is closest to 196 + 605 + 600? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  31. 31.Which is closest to 2799 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  32. 32.Round 46910 to the nearest thousand.
  33. 33.Which is closest to 897 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  34. 34.Which is closest to 1793 ÷ 21? (a) 45 (b) 90 (c) 180 (d) 900
  35. 35.Which is closest to 904 × 81? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  36. 36.Which is closest to 2007 ÷ 39? (a) 100 (b) 50 (c) 25 (d) 500
  37. 37.Round 4701 to the nearest ten.
  38. 38.Which is closest to 1191 ÷ 21? (a) 60 (b) 120 (c) 30 (d) 600
  39. 39.Round 64.33 to one decimal place. =
  40. 40.Round 17.17 to one decimal place. =

Answer key

  1. 99280
  2. 30100
  3. 38000
  4. 61.6
  5. 51.4
  6. 90
  7. 14.4
  8. 66.1
  9. 80
  10. 51.8
  11. 95320
  12. 90
  13. 70
  14. 27000
  15. 24000
  16. 2000
  17. 42000
  18. 20
  19. 21000
  20. 26.6
  21. 80
  22. 50
  23. 18000
  24. 50
  25. 1000
  26. 30
  27. 16000
  28. 18000
  29. 32000
  30. 1400
  31. 70
  32. 47000
  33. 30
  34. 90
  35. 72000
  36. 50
  37. 4700
  38. 60
  39. 64.3
  40. 17.2

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