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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 545 · 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 606 ÷ 19? (a) 300 (b) 30 (c) 15 (d) 60
  2. 2.Which is closest to 801 × 48? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  3. 3.Which is closest to 2109 ÷ 31? (a) 35 (b) 70 (c) 700 (d) 140
  4. 4.Which is closest to 598 × 89? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  5. 5.Which is closest to 3502 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  6. 6.Round 7252 to the nearest ten.
  7. 7.Round 23.14 to one decimal place. =
  8. 8.Which is closest to 1003 ÷ 51? (a) 40 (b) 200 (c) 10 (d) 20
  9. 9.Which is closest to 102 + 200 + 95? (a) 600 (b) 300 (c) 400 (d) 500
  10. 10.Which is closest to 796 × 42? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  11. 11.Which is closest to 796 × 61? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  12. 12.Round 61.69 to one decimal place. =
  13. 13.Round 15790 to the nearest thousand.
  14. 14.Round 17.36 to one decimal place. =
  15. 15.Which is closest to 101 + 203 + 501? (a) 800 (b) 700 (c) 1000 (d) 900
  16. 16.Which is closest to 697 × 79? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  17. 17.Round 98.87 to one decimal place. =
  18. 18.Round 94.16 to one decimal place. =
  19. 19.Which is closest to 799 × 89? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  20. 20.Round 32.43 to one decimal place. =
  21. 21.Round 51.49 to one decimal place. =
  22. 22.Round 98206 to the nearest ten.
  23. 23.Which is closest to 1503 ÷ 49? (a) 15 (b) 30 (c) 60 (d) 300
  24. 24.Round 31.68 to one decimal place. =
  25. 25.Round 24.16 to one decimal place. =
  26. 26.Which is closest to 498 + 701 + 598? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  27. 27.Which is closest to 800 × 79? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  28. 28.Which is closest to 104 + 204 + 596? (a) 800 (b) 1100 (c) 1000 (d) 900
  29. 29.Which is closest to 503 × 40? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  30. 30.Which is closest to 1408 ÷ 21? (a) 140 (b) 35 (c) 70 (d) 700
  31. 31.Round 17.69 to one decimal place. =
  32. 32.Round 34.06 to one decimal place. =
  33. 33.Which is closest to 701 × 31? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  34. 34.Round 96636 to the nearest ten.
  35. 35.Round 28096 to the nearest ten.
  36. 36.Which is closest to 802 × 50? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  37. 37.Round 64.33 to one decimal place. =
  38. 38.Which is closest to 301 + 396 + 304? (a) 1200 (b) 1000 (c) 900 (d) 1100
  39. 39.Which is closest to 1207 ÷ 31? (a) 40 (b) 80 (c) 400 (d) 20
  40. 40.Round 39.06 to one decimal place. =

Answer key

  1. 30
  2. 40000
  3. 70
  4. 54000
  5. 70
  6. 7250
  7. 23.1
  8. 20
  9. 400
  10. 32000
  11. 48000
  12. 61.7
  13. 16000
  14. 17.4
  15. 800
  16. 56000
  17. 98.9
  18. 94.2
  19. 72000
  20. 32.4
  21. 51.5
  22. 98210
  23. 30
  24. 31.7
  25. 24.2
  26. 1800
  27. 64000
  28. 900
  29. 20000
  30. 70
  31. 17.7
  32. 34.1
  33. 21000
  34. 96640
  35. 28100
  36. 40000
  37. 64.3
  38. 1000
  39. 40
  40. 39.1

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