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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 301 · 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 397 + 896 + 699? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  2. 2.Round 59193 to the nearest ten.
  3. 3.Which is closest to 699 × 28? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  4. 4.Which is closest to 804 × 59? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  5. 5.Round 84.37 to one decimal place. =
  6. 6.Which is closest to 900 + 101 + 595? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  7. 7.Which is closest to 803 + 596 + 503? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  8. 8.Which is closest to 497 × 28? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  9. 9.Round 81478 to the nearest ten.
  10. 10.Which is closest to 395 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  11. 11.Which is closest to 596 × 48? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  12. 12.Round 70.57 to one decimal place. =
  13. 13.Which is closest to 796 + 896 + 103? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  14. 14.Which is closest to 895 + 298 + 196? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  15. 15.Which is closest to 3598 ÷ 41? (a) 900 (b) 90 (c) 45 (d) 180
  16. 16.Round 40.62 to one decimal place. =
  17. 17.Which is closest to 899 × 62? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  18. 18.Which is closest to 700 + 302 + 202? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  19. 19.Round 21741 to the nearest thousand.
  20. 20.Round 51396 to the nearest ten.
  21. 21.Which is closest to 898 + 297 + 900? (a) 2300 (b) 2200 (c) 2000 (d) 2100
  22. 22.Which is closest to 303 × 52? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  23. 23.Round 26321 to the nearest thousand.
  24. 24.Which is closest to 1200 ÷ 31? (a) 80 (b) 40 (c) 400 (d) 20
  25. 25.Which is closest to 701 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  26. 26.Which is closest to 802 × 39? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  27. 27.Round 26868 to the nearest ten.
  28. 28.Which is closest to 104 + 496 + 401? (a) 1000 (b) 1100 (c) 1200 (d) 900
  29. 29.Round 33.43 to one decimal place. =
  30. 30.Which is closest to 1808 ÷ 29? (a) 60 (b) 120 (c) 30 (d) 600
  31. 31.Round 72837 to the nearest ten.
  32. 32.Which is closest to 1207 ÷ 19? (a) 120 (b) 30 (c) 600 (d) 60
  33. 33.Which is closest to 1005 ÷ 19? (a) 500 (b) 100 (c) 50 (d) 25
  34. 34.Round 15.73 to one decimal place. =
  35. 35.Round 25717 to the nearest thousand.
  36. 36.Which is closest to 205 + 797 + 305? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  37. 37.Round 10.52 to one decimal place. =
  38. 38.Which is closest to 302 + 196 + 596? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  39. 39.Which is closest to 597 × 60? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  40. 40.Round 14617 to the nearest hundred.

Answer key

  1. 2000
  2. 59190
  3. 21000
  4. 48000
  5. 84.4
  6. 1600
  7. 1900
  8. 15000
  9. 81480
  10. 20
  11. 30000
  12. 70.6
  13. 1800
  14. 1400
  15. 90
  16. 40.6
  17. 54000
  18. 1200
  19. 22000
  20. 51400
  21. 2100
  22. 15000
  23. 26000
  24. 40
  25. 14000
  26. 32000
  27. 26870
  28. 1000
  29. 33.4
  30. 60
  31. 72840
  32. 60
  33. 50
  34. 15.7
  35. 26000
  36. 1300
  37. 10.5
  38. 1100
  39. 36000
  40. 14600

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