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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 749 · 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 795 + 301 + 705? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  2. 2.Which is closest to 394 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  3. 3.Which is closest to 696 × 72? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  4. 4.Which is closest to 900 + 196 + 98? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  5. 5.Which is closest to 196 × 61? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  6. 6.Which is closest to 795 + 297 + 499? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  7. 7.Which is closest to 1509 ÷ 51? (a) 15 (b) 60 (c) 30 (d) 300
  8. 8.Which is closest to 2004 ÷ 41? (a) 100 (b) 25 (c) 50 (d) 500
  9. 9.Which is closest to 497 × 90? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  10. 10.Which is closest to 896 + 202 + 105? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  11. 11.Which is closest to 699 × 88? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  12. 12.Round 39.13 to one decimal place. =
  13. 13.Round 74.73 to one decimal place. =
  14. 14.Which is closest to 297 × 20? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  15. 15.Which is closest to 196 × 68? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  16. 16.Which is closest to 904 × 40? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  17. 17.Which is closest to 2094 ÷ 29? (a) 70 (b) 700 (c) 35 (d) 140
  18. 18.Which is closest to 402 × 78? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  19. 19.Round 83.86 to one decimal place. =
  20. 20.Which is closest to 2002 ÷ 49? (a) 20 (b) 40 (c) 400 (d) 80
  21. 21.Which is closest to 400 × 52? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  22. 22.Round 81.87 to one decimal place. =
  23. 23.Round 97800 to the nearest thousand.
  24. 24.Which is closest to 395 + 204 + 301? (a) 900 (b) 800 (c) 1000 (d) 1100
  25. 25.Round 68.49 to one decimal place. =
  26. 26.Which is closest to 502 + 101 + 700? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  27. 27.Round 36.88 to one decimal place. =
  28. 28.Which is closest to 802 × 89? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  29. 29.Which is closest to 1201 ÷ 21? (a) 600 (b) 60 (c) 30 (d) 120
  30. 30.Round 23509 to the nearest thousand.
  31. 31.Round 62780 to the nearest thousand.
  32. 32.Which is closest to 198 + 596 + 900? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  33. 33.Round 84745 to the nearest thousand.
  34. 34.Which is closest to 4505 ÷ 51? (a) 45 (b) 180 (c) 90 (d) 900
  35. 35.Which is closest to 4502 ÷ 51? (a) 900 (b) 180 (c) 45 (d) 90
  36. 36.Which is closest to 696 × 19? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  37. 37.Round 21.23 to one decimal place. =
  38. 38.Round 41643 to the nearest ten.
  39. 39.Which is closest to 904 + 100 + 895? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  40. 40.Round 96.68 to one decimal place. =

Answer key

  1. 1800
  2. 20
  3. 49000
  4. 1200
  5. 12000
  6. 1600
  7. 30
  8. 50
  9. 45000
  10. 1200
  11. 63000
  12. 39.1
  13. 74.7
  14. 6000
  15. 14000
  16. 36000
  17. 70
  18. 32000
  19. 83.9
  20. 40
  21. 20000
  22. 81.9
  23. 98000
  24. 900
  25. 68.5
  26. 1300
  27. 36.9
  28. 72000
  29. 60
  30. 24000
  31. 63000
  32. 1700
  33. 85000
  34. 90
  35. 90
  36. 14000
  37. 21.2
  38. 41640
  39. 1900
  40. 96.7

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