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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 45 · 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 299 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  2. 2.Which is closest to 700 × 81? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  3. 3.Round 38.27 to one decimal place. =
  4. 4.Round 50.38 to one decimal place. =
  5. 5.Which is closest to 503 × 31? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  6. 6.Round 59952 to the nearest hundred.
  7. 7.Which is closest to 1399 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  8. 8.Which is closest to 1194 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  9. 9.Round 77.71 to one decimal place. =
  10. 10.Which is closest to 201 + 805 + 804? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  11. 11.Which is closest to 705 + 897 + 105? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  12. 12.Which is closest to 199 × 90? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  13. 13.Which is closest to 700 + 200 + 304? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  14. 14.Which is closest to 3002 ÷ 51? (a) 30 (b) 120 (c) 600 (d) 60
  15. 15.Which is closest to 1202 ÷ 29? (a) 400 (b) 40 (c) 80 (d) 20
  16. 16.Round 98558 to the nearest hundred.
  17. 17.Which is closest to 498 + 600 + 703? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  18. 18.Which is closest to 296 × 29? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  19. 19.Which is closest to 96 + 395 + 401? (a) 800 (b) 900 (c) 1000 (d) 1100
  20. 20.Which is closest to 3495 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  21. 21.Round 45044 to the nearest hundred.
  22. 22.Which is closest to 3503 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  23. 23.Round 36161 to the nearest hundred.
  24. 24.Round 11.64 to one decimal place. =
  25. 25.Which is closest to 301 × 18? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  26. 26.Which is closest to 800 × 71? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  27. 27.Which is closest to 496 + 797 + 798? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  28. 28.Round 81874 to the nearest thousand.
  29. 29.Which is closest to 897 × 49? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
  30. 30.Round 31.44 to one decimal place. =
  31. 31.Round 1405 to the nearest thousand.
  32. 32.Which is closest to 802 × 92? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  33. 33.Round 39.88 to one decimal place. =
  34. 34.Round 94052 to the nearest ten.
  35. 35.Round 4699 to the nearest hundred.
  36. 36.Which is closest to 205 + 402 + 402? (a) 1200 (b) 1100 (c) 900 (d) 1000
  37. 37.Which is closest to 391 ÷ 19? (a) 40 (b) 20 (c) 10 (d) 200
  38. 38.Which is closest to 1494 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
  39. 39.Round 89.12 to one decimal place. =
  40. 40.Which is closest to 799 + 99 + 705? (a) 1800 (b) 1600 (c) 1500 (d) 1700

Answer key

  1. 27000
  2. 56000
  3. 38.3
  4. 50.4
  5. 15000
  6. 60000
  7. 70
  8. 60
  9. 77.7
  10. 1800
  11. 1700
  12. 18000
  13. 1200
  14. 60
  15. 40
  16. 98600
  17. 1800
  18. 9000
  19. 900
  20. 70
  21. 45000
  22. 70
  23. 36200
  24. 11.6
  25. 6000
  26. 56000
  27. 2100
  28. 82000
  29. 45000
  30. 31.4
  31. 1000
  32. 72000
  33. 39.9
  34. 94050
  35. 4700
  36. 1000
  37. 20
  38. 30
  39. 89.1
  40. 1600

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