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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 767 · 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 75888 to the nearest ten.
  2. 2.Round 73156 to the nearest thousand.
  3. 3.Which is closest to 597 × 91? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
  4. 4.Which is closest to 499 × 38? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  5. 5.Round 78.42 to one decimal place. =
  6. 6.Round 18322 to the nearest hundred.
  7. 7.Round 21412 to the nearest ten.
  8. 8.Which is closest to 2402 ÷ 41? (a) 120 (b) 30 (c) 60 (d) 600
  9. 9.Which is closest to 302 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  10. 10.Round 70.41 to one decimal place. =
  11. 11.Which is closest to 699 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  12. 12.Which is closest to 1795 ÷ 29? (a) 60 (b) 30 (c) 600 (d) 120
  13. 13.Round 99.07 to one decimal place. =
  14. 14.Which is closest to 202 + 297 + 103? (a) 700 (b) 800 (c) 600 (d) 500
  15. 15.Which is closest to 701 + 302 + 396? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  16. 16.Which is closest to 3999 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  17. 17.Round 73415 to the nearest hundred.
  18. 18.Round 18.44 to one decimal place. =
  19. 19.Round 32.67 to one decimal place. =
  20. 20.Which is closest to 705 + 201 + 200? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  21. 21.Round 63949 to the nearest thousand.
  22. 22.Which is closest to 697 + 897 + 904? (a) 2400 (b) 2700 (c) 2500 (d) 2600
  23. 23.Which is closest to 996 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25
  24. 24.Which is closest to 1596 ÷ 19? (a) 80 (b) 160 (c) 40 (d) 800
  25. 25.Which is closest to 1493 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  26. 26.Which is closest to 607 ÷ 19? (a) 60 (b) 15 (c) 30 (d) 300
  27. 27.Round 74887 to the nearest thousand.
  28. 28.Which is closest to 305 + 496 + 296? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  29. 29.Round 6192 to the nearest ten.
  30. 30.Which is closest to 804 × 21? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  31. 31.Which is closest to 2403 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  32. 32.Which is closest to 197 + 396 + 302? (a) 900 (b) 1000 (c) 1100 (d) 800
  33. 33.Which is closest to 797 × 58? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  34. 34.Round 27.54 to one decimal place. =
  35. 35.Which is closest to 898 × 82? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  36. 36.Which is closest to 2007 ÷ 39? (a) 100 (b) 500 (c) 50 (d) 25
  37. 37.Round 47377 to the nearest ten.
  38. 38.Which is closest to 903 + 104 + 303? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  39. 39.Round 57637 to the nearest hundred.
  40. 40.Which is closest to 1791 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600

Answer key

  1. 75890
  2. 73000
  3. 54000
  4. 20000
  5. 78.4
  6. 18300
  7. 21410
  8. 60
  9. 6000
  10. 70.4
  11. 49000
  12. 60
  13. 99.1
  14. 600
  15. 1400
  16. 80
  17. 73400
  18. 18.4
  19. 32.7
  20. 1100
  21. 64000
  22. 2500
  23. 50
  24. 80
  25. 50
  26. 30
  27. 75000
  28. 1100
  29. 6190
  30. 16000
  31. 80
  32. 900
  33. 48000
  34. 27.5
  35. 72000
  36. 50
  37. 47380
  38. 1300
  39. 57600
  40. 60

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