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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 632 · 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 1508 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  2. 2.Round 29667 to the nearest ten.
  3. 3.Which is closest to 404 + 396 + 503? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  4. 4.Which is closest to 200 + 404 + 803? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  5. 5.Round 34413 to the nearest ten.
  6. 6.Round 80.87 to one decimal place. =
  7. 7.Which is closest to 698 × 89? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  8. 8.Round 61225 to the nearest thousand.
  9. 9.Round 32.76 to one decimal place. =
  10. 10.Which is closest to 305 + 596 + 201? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  11. 11.Which is closest to 404 + 805 + 303? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  12. 12.Round 14.48 to one decimal place. =
  13. 13.Which is closest to 1507 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  14. 14.Which is closest to 994 ÷ 21? (a) 50 (b) 100 (c) 500 (d) 25
  15. 15.Which is closest to 105 + 703 + 100? (a) 1000 (b) 800 (c) 900 (d) 1100
  16. 16.Which is closest to 4501 ÷ 51? (a) 90 (b) 900 (c) 45 (d) 180
  17. 17.Which is closest to 1505 ÷ 29? (a) 25 (b) 100 (c) 500 (d) 50
  18. 18.Which is closest to 598 + 96 + 703? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  19. 19.Which is closest to 103 + 199 + 297? (a) 700 (b) 600 (c) 500 (d) 800
  20. 20.Round 93961 to the nearest ten.
  21. 21.Which is closest to 797 × 79? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  22. 22.Round 52.41 to one decimal place. =
  23. 23.Round 19.93 to one decimal place. =
  24. 24.Round 56.67 to one decimal place. =
  25. 25.Which is closest to 596 + 797 + 204? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  26. 26.Which is closest to 397 × 38? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  27. 27.Which is closest to 302 × 58? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  28. 28.Round 52088 to the nearest hundred.
  29. 29.Which is closest to 1798 ÷ 31? (a) 30 (b) 600 (c) 120 (d) 60
  30. 30.Which is closest to 298 × 50? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  31. 31.Round 12439 to the nearest ten.
  32. 32.Which is closest to 2796 ÷ 39? (a) 140 (b) 35 (c) 70 (d) 700
  33. 33.Round 45.31 to one decimal place. =
  34. 34.Which is closest to 604 × 60? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  35. 35.Which is closest to 597 × 52? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  36. 36.Which is closest to 704 × 81? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  37. 37.Which is closest to 304 × 19? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  38. 38.Which is closest to 501 × 20? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  39. 39.Which is closest to 2096 ÷ 29? (a) 35 (b) 140 (c) 700 (d) 70
  40. 40.Round 47.36 to one decimal place. =

Answer key

  1. 30
  2. 29670
  3. 1300
  4. 1400
  5. 34410
  6. 80.9
  7. 63000
  8. 61000
  9. 32.8
  10. 1100
  11. 1500
  12. 14.5
  13. 30
  14. 50
  15. 900
  16. 90
  17. 50
  18. 1400
  19. 600
  20. 93960
  21. 64000
  22. 52.4
  23. 19.9
  24. 56.7
  25. 1600
  26. 16000
  27. 18000
  28. 52100
  29. 60
  30. 15000
  31. 12440
  32. 70
  33. 45.3
  34. 36000
  35. 30000
  36. 56000
  37. 6000
  38. 10000
  39. 70
  40. 47.4

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