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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 986 · 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 900 × 38? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  2. 2.Round 26.07 to one decimal place. =
  3. 3.Round 86303 to the nearest ten.
  4. 4.Round 55796 to the nearest thousand.
  5. 5.Which is closest to 302 × 28? (Round each number first.) (a) 90000 (b) 9000 (c) 900 (d) 18000
  6. 6.Which is closest to 2505 ÷ 51? (a) 100 (b) 50 (c) 500 (d) 25
  7. 7.Which is closest to 3495 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  8. 8.Which is closest to 3499 ÷ 49? (a) 140 (b) 70 (c) 700 (d) 35
  9. 9.Round 31.33 to one decimal place. =
  10. 10.Round 78624 to the nearest thousand.
  11. 11.Which is closest to 197 × 38? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  12. 12.Which is closest to 696 × 88? (Round each number first.) (a) 630000 (b) 63000 (c) 126000 (d) 6300
  13. 13.Which is closest to 404 × 88? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  14. 14.Which is closest to 1195 ÷ 41? (a) 300 (b) 30 (c) 60 (d) 15
  15. 15.Which is closest to 600 + 99 + 303? (a) 1100 (b) 900 (c) 1000 (d) 1200
  16. 16.Which is closest to 303 × 50? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  17. 17.Round 49.63 to one decimal place. =
  18. 18.Round 21.58 to one decimal place. =
  19. 19.Which is closest to 602 + 797 + 503? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  20. 20.Which is closest to 2703 ÷ 31? (a) 45 (b) 900 (c) 90 (d) 180
  21. 21.Which is closest to 299 × 80? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  22. 22.Which is closest to 205 + 405 + 104? (a) 700 (b) 800 (c) 600 (d) 900
  23. 23.Which is closest to 399 + 297 + 705? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  24. 24.Which is closest to 3202 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  25. 25.Round 88.21 to one decimal place. =
  26. 26.Which is closest to 397 + 795 + 299? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  27. 27.Round 25.28 to one decimal place. =
  28. 28.Which is closest to 402 × 88? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  29. 29.Which is closest to 101 + 599 + 97? (a) 900 (b) 1000 (c) 800 (d) 700
  30. 30.Which is closest to 599 × 22? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  31. 31.Which is closest to 899 × 48? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  32. 32.Round 81.51 to one decimal place. =
  33. 33.Which is closest to 1592 ÷ 41? (a) 40 (b) 20 (c) 80 (d) 400
  34. 34.Which is closest to 405 + 104 + 903? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  35. 35.Which is closest to 1800 ÷ 21? (a) 45 (b) 180 (c) 900 (d) 90
  36. 36.Round 31127 to the nearest thousand.
  37. 37.Round 54.56 to one decimal place. =
  38. 38.Which is closest to 2499 ÷ 51? (a) 100 (b) 500 (c) 50 (d) 25
  39. 39.Which is closest to 900 ÷ 31? (a) 15 (b) 60 (c) 300 (d) 30
  40. 40.Which is closest to 599 × 81? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000

Answer key

  1. 36000
  2. 26.1
  3. 86300
  4. 56000
  5. 9000
  6. 50
  7. 70
  8. 70
  9. 31.3
  10. 79000
  11. 8000
  12. 63000
  13. 36000
  14. 30
  15. 1000
  16. 15000
  17. 49.6
  18. 21.6
  19. 1900
  20. 90
  21. 24000
  22. 700
  23. 1400
  24. 80
  25. 88.2
  26. 1500
  27. 25.3
  28. 36000
  29. 800
  30. 12000
  31. 45000
  32. 81.5
  33. 40
  34. 1400
  35. 90
  36. 31000
  37. 54.6
  38. 50
  39. 30
  40. 48000

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