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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 790 · 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 25.39 to one decimal place. =
  2. 2.Which is closest to 802 ÷ 21? (a) 20 (b) 40 (c) 80 (d) 400
  3. 3.Round 57246 to the nearest thousand.
  4. 4.Which is closest to 2095 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  5. 5.Which is closest to 498 + 97 + 799? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  6. 6.Which is closest to 2408 ÷ 31? (a) 40 (b) 160 (c) 80 (d) 800
  7. 7.Round 65249 to the nearest thousand.
  8. 8.Which is closest to 402 + 500 + 101? (a) 1100 (b) 1000 (c) 900 (d) 1200
  9. 9.Which is closest to 900 ÷ 29? (a) 60 (b) 30 (c) 15 (d) 300
  10. 10.Round 50.81 to one decimal place. =
  11. 11.Round 86.72 to one decimal place. =
  12. 12.Which is closest to 96 + 604 + 599? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  13. 13.Round 11.26 to one decimal place. =
  14. 14.Which is closest to 700 × 18? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  15. 15.Which is closest to 600 × 92? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  16. 16.Which is closest to 406 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  17. 17.Round 61.59 to one decimal place. =
  18. 18.Which is closest to 197 × 31? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  19. 19.Round 49097 to the nearest thousand.
  20. 20.Which is closest to 399 × 58? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  21. 21.Round 3362 to the nearest ten.
  22. 22.Which is closest to 602 × 82? (Round each number first.) (a) 48000 (b) 4800 (c) 480000 (d) 96000
  23. 23.Round 51996 to the nearest hundred.
  24. 24.Which is closest to 201 × 22? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  25. 25.Which is closest to 602 × 29? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  26. 26.Which is closest to 798 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  27. 27.Round 12651 to the nearest thousand.
  28. 28.Round 79530 to the nearest hundred.
  29. 29.Round 72952 to the nearest hundred.
  30. 30.Which is closest to 504 × 39? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  31. 31.Which is closest to 3591 ÷ 41? (a) 900 (b) 90 (c) 45 (d) 180
  32. 32.Which is closest to 1996 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  33. 33.Round 16030 to the nearest thousand.
  34. 34.Round 11.07 to one decimal place. =
  35. 35.Round 50509 to the nearest ten.
  36. 36.Round 70.88 to one decimal place. =
  37. 37.Round 59862 to the nearest ten.
  38. 38.Which is closest to 803 × 18? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  39. 39.Which is closest to 3208 ÷ 41? (a) 800 (b) 40 (c) 160 (d) 80
  40. 40.Round 13.79 to one decimal place. =

Answer key

  1. 25.4
  2. 40
  3. 57000
  4. 70
  5. 1400
  6. 80
  7. 65000
  8. 1000
  9. 30
  10. 50.8
  11. 86.7
  12. 1300
  13. 11.3
  14. 14000
  15. 54000
  16. 20
  17. 61.6
  18. 6000
  19. 49000
  20. 24000
  21. 3360
  22. 48000
  23. 52000
  24. 4000
  25. 18000
  26. 40
  27. 13000
  28. 79500
  29. 73000
  30. 20000
  31. 90
  32. 50
  33. 16000
  34. 11.1
  35. 50510
  36. 70.9
  37. 59860
  38. 16000
  39. 80
  40. 13.8

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