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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 239 · 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 57262 to the nearest hundred.
  2. 2.Which is closest to 1497 ÷ 49? (a) 300 (b) 15 (c) 30 (d) 60
  3. 3.Round 21372 to the nearest ten.
  4. 4.Round 23752 to the nearest ten.
  5. 5.Which is closest to 195 + 99 + 503? (a) 700 (b) 1000 (c) 900 (d) 800
  6. 6.Round 96214 to the nearest thousand.
  7. 7.Round 69.41 to one decimal place. =
  8. 8.Which is closest to 303 × 42? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  9. 9.Which is closest to 3997 ÷ 51? (a) 800 (b) 40 (c) 80 (d) 160
  10. 10.Round 79.09 to one decimal place. =
  11. 11.Which is closest to 97 + 805 + 699? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  12. 12.Which is closest to 3202 ÷ 39? (a) 80 (b) 160 (c) 800 (d) 40
  13. 13.Which is closest to 799 + 697 + 398? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  14. 14.Round 59306 to the nearest hundred.
  15. 15.Which is closest to 902 × 52? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  16. 16.Which is closest to 400 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  17. 17.Which is closest to 298 × 71? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  18. 18.Round 87.46 to one decimal place. =
  19. 19.Which is closest to 1391 ÷ 21? (a) 70 (b) 700 (c) 35 (d) 140
  20. 20.Which is closest to 502 × 51? (Round each number first.) (a) 2500 (b) 50000 (c) 250000 (d) 25000
  21. 21.Which is closest to 901 + 699 + 102? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  22. 22.Which is closest to 4003 ÷ 51? (a) 40 (b) 160 (c) 80 (d) 800
  23. 23.Which is closest to 302 × 18? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  24. 24.Round 66994 to the nearest hundred.
  25. 25.Which is closest to 3191 ÷ 41? (a) 80 (b) 160 (c) 40 (d) 800
  26. 26.Which is closest to 401 × 81? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  27. 27.Which is closest to 701 × 68? (Round each number first.) (a) 4900 (b) 98000 (c) 490000 (d) 49000
  28. 28.Which is closest to 392 ÷ 21? (a) 200 (b) 20 (c) 10 (d) 40
  29. 29.Which is closest to 301 + 805 + 399? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  30. 30.Round 76.13 to one decimal place. =
  31. 31.Which is closest to 994 ÷ 49? (a) 20 (b) 40 (c) 10 (d) 200
  32. 32.Round 41.23 to one decimal place. =
  33. 33.Round 31.57 to one decimal place. =
  34. 34.Round 34629 to the nearest hundred.
  35. 35.Which is closest to 996 ÷ 19? (a) 50 (b) 500 (c) 25 (d) 100
  36. 36.Round 69.38 to one decimal place. =
  37. 37.Round 53947 to the nearest hundred.
  38. 38.Round 57.24 to one decimal place. =
  39. 39.Round 28.09 to one decimal place. =
  40. 40.Which is closest to 202 × 22? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000

Answer key

  1. 57300
  2. 30
  3. 21370
  4. 23750
  5. 800
  6. 96000
  7. 69.4
  8. 12000
  9. 80
  10. 79.1
  11. 1600
  12. 80
  13. 1900
  14. 59300
  15. 45000
  16. 20
  17. 21000
  18. 87.5
  19. 70
  20. 25000
  21. 1700
  22. 80
  23. 6000
  24. 67000
  25. 80
  26. 32000
  27. 49000
  28. 20
  29. 1500
  30. 76.1
  31. 20
  32. 41.2
  33. 31.6
  34. 34600
  35. 50
  36. 69.4
  37. 53900
  38. 57.2
  39. 28.1
  40. 4000

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