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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 105 · 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 95376 to the nearest ten.
  2. 2.Round 85113 to the nearest ten.
  3. 3.Round 33183 to the nearest thousand.
  4. 4.Which is closest to 797 × 90? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
  5. 5.Which is closest to 403 × 50? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  6. 6.Which is closest to 198 + 202 + 97? (a) 600 (b) 700 (c) 500 (d) 400
  7. 7.Round 15709 to the nearest ten.
  8. 8.Which is closest to 1607 ÷ 41? (a) 80 (b) 20 (c) 400 (d) 40
  9. 9.Which is closest to 898 × 89? (Round each number first.) (a) 8100 (b) 81000 (c) 162000 (d) 810000
  10. 10.Which is closest to 199 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  11. 11.Which is closest to 1004 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  12. 12.Round 71466 to the nearest ten.
  13. 13.Round 69.63 to one decimal place. =
  14. 14.Which is closest to 303 × 78? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  15. 15.Which is closest to 402 + 601 + 297? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  16. 16.Round 34.06 to one decimal place. =
  17. 17.Which is closest to 800 × 82? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  18. 18.Round 22326 to the nearest thousand.
  19. 19.Round 45.73 to one decimal place. =
  20. 20.Round 35.08 to one decimal place. =
  21. 21.Round 25.71 to one decimal place. =
  22. 22.Which is closest to 1402 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  23. 23.Which is closest to 201 + 400 + 703? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  24. 24.Which is closest to 603 × 19? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  25. 25.Round 56046 to the nearest hundred.
  26. 26.Which is closest to 398 + 501 + 696? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  27. 27.Round 74.44 to one decimal place. =
  28. 28.Round 34.88 to one decimal place. =
  29. 29.Round 10.49 to one decimal place. =
  30. 30.Which is closest to 396 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  31. 31.Round 31295 to the nearest hundred.
  32. 32.Which is closest to 400 × 18? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  33. 33.Which is closest to 199 + 400 + 97? (a) 600 (b) 800 (c) 900 (d) 700
  34. 34.Which is closest to 202 × 58? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  35. 35.Which is closest to 2008 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  36. 36.Which is closest to 397 + 303 + 900? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  37. 37.Which is closest to 597 × 90? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  38. 38.Which is closest to 495 + 302 + 97? (a) 900 (b) 1100 (c) 1000 (d) 800
  39. 39.Which is closest to 993 ÷ 19? (a) 500 (b) 100 (c) 50 (d) 25
  40. 40.Round 87.44 to one decimal place. =

Answer key

  1. 95380
  2. 85110
  3. 33000
  4. 72000
  5. 20000
  6. 500
  7. 15710
  8. 40
  9. 81000
  10. 8000
  11. 20
  12. 71470
  13. 69.6
  14. 24000
  15. 1300
  16. 34.1
  17. 64000
  18. 22000
  19. 45.7
  20. 35.1
  21. 25.7
  22. 70
  23. 1300
  24. 12000
  25. 56000
  26. 1600
  27. 74.4
  28. 34.9
  29. 10.5
  30. 20
  31. 31300
  32. 8000
  33. 700
  34. 12000
  35. 50
  36. 1600
  37. 54000
  38. 900
  39. 50
  40. 87.4

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