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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 485 · 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 799 × 19? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  2. 2.Which is closest to 396 + 201 + 502? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  3. 3.Which is closest to 503 × 39? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  4. 4.Which is closest to 602 + 805 + 195? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  5. 5.Round 75999 to the nearest thousand.
  6. 6.Round 45.46 to one decimal place. =
  7. 7.Which is closest to 2993 ÷ 51? (a) 600 (b) 120 (c) 30 (d) 60
  8. 8.Round 83068 to the nearest ten.
  9. 9.Round 29.28 to one decimal place. =
  10. 10.Which is closest to 301 × 29? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  11. 11.Round 14.06 to one decimal place. =
  12. 12.Round 11.21 to one decimal place. =
  13. 13.Which is closest to 802 + 597 + 401? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  14. 14.Which is closest to 1995 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
  15. 15.Which is closest to 696 × 21? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  16. 16.Round 76486 to the nearest hundred.
  17. 17.Which is closest to 1607 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  18. 18.Round 87.62 to one decimal place. =
  19. 19.Round 60986 to the nearest thousand.
  20. 20.Which is closest to 798 × 42? (Round each number first.) (a) 320000 (b) 32000 (c) 3200 (d) 64000
  21. 21.Which is closest to 993 ÷ 19? (a) 500 (b) 50 (c) 100 (d) 25
  22. 22.Which is closest to 1593 ÷ 41? (a) 20 (b) 400 (c) 80 (d) 40
  23. 23.Round 44.87 to one decimal place. =
  24. 24.Which is closest to 795 ÷ 41? (a) 200 (b) 10 (c) 40 (d) 20
  25. 25.Which is closest to 96 + 897 + 596? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  26. 26.Which is closest to 905 + 701 + 402? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  27. 27.Round 18.48 to one decimal place. =
  28. 28.Which is closest to 400 × 92? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  29. 29.Which is closest to 201 × 90? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  30. 30.Round 40225 to the nearest hundred.
  31. 31.Which is closest to 600 ÷ 29? (a) 200 (b) 20 (c) 40 (d) 10
  32. 32.Which is closest to 502 × 90? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  33. 33.Round 16.12 to one decimal place. =
  34. 34.Round 99946 to the nearest ten.
  35. 35.Which is closest to 1192 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  36. 36.Which is closest to 501 + 295 + 198? (a) 1100 (b) 900 (c) 1200 (d) 1000
  37. 37.Round 73.42 to one decimal place. =
  38. 38.Which is closest to 593 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  39. 39.Which is closest to 900 × 49? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  40. 40.Round 60826 to the nearest hundred.

Answer key

  1. 16000
  2. 1100
  3. 20000
  4. 1600
  5. 76000
  6. 45.5
  7. 60
  8. 83070
  9. 29.3
  10. 9000
  11. 14.1
  12. 11.2
  13. 1800
  14. 50
  15. 14000
  16. 76500
  17. 80
  18. 87.6
  19. 61000
  20. 32000
  21. 50
  22. 40
  23. 44.9
  24. 20
  25. 1600
  26. 2000
  27. 18.5
  28. 36000
  29. 18000
  30. 40200
  31. 20
  32. 45000
  33. 16.1
  34. 99950
  35. 60
  36. 1000
  37. 73.4
  38. 20
  39. 45000
  40. 60800

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