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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 669 · 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 68.76 to one decimal place. =
  2. 2.Round 84172 to the nearest ten.
  3. 3.Round 25554 to the nearest ten.
  4. 4.Which is closest to 2696 ÷ 29? (a) 45 (b) 900 (c) 180 (d) 90
  5. 5.Which is closest to 496 × 78? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000
  6. 6.Round 2271 to the nearest hundred.
  7. 7.Which is closest to 600 × 89? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  8. 8.Round 53845 to the nearest thousand.
  9. 9.Round 37.51 to one decimal place. =
  10. 10.Which is closest to 2806 ÷ 39? (a) 35 (b) 700 (c) 140 (d) 70
  11. 11.Which is closest to 802 × 90? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  12. 12.Round 54155 to the nearest thousand.
  13. 13.Which is closest to 900 × 31? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  14. 14.Which is closest to 2395 ÷ 31? (a) 40 (b) 80 (c) 800 (d) 160
  15. 15.Round 52.44 to one decimal place. =
  16. 16.Which is closest to 505 + 703 + 296? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  17. 17.Which is closest to 1595 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  18. 18.Round 40627 to the nearest hundred.
  19. 19.Which is closest to 304 × 39? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  20. 20.Round 69787 to the nearest ten.
  21. 21.Round 68.27 to one decimal place. =
  22. 22.Round 33.93 to one decimal place. =
  23. 23.Round 3412 to the nearest ten.
  24. 24.Which is closest to 505 + 796 + 97? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  25. 25.Which is closest to 398 × 52? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  26. 26.Which is closest to 199 × 49? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  27. 27.Which is closest to 798 + 296 + 699? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  28. 28.Which is closest to 1503 ÷ 31? (a) 100 (b) 25 (c) 50 (d) 500
  29. 29.Round 48.34 to one decimal place. =
  30. 30.Which is closest to 397 × 38? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  31. 31.Which is closest to 700 × 39? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  32. 32.Round 48.09 to one decimal place. =
  33. 33.Round 61344 to the nearest hundred.
  34. 34.Which is closest to 696 × 32? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  35. 35.Round 45.63 to one decimal place. =
  36. 36.Round 82.11 to one decimal place. =
  37. 37.Which is closest to 696 + 895 + 96? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  38. 38.Which is closest to 4006 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
  39. 39.Round 91.74 to one decimal place. =
  40. 40.Which is closest to 302 × 79? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400

Answer key

  1. 68.8
  2. 84170
  3. 25550
  4. 90
  5. 40000
  6. 2300
  7. 54000
  8. 54000
  9. 37.5
  10. 70
  11. 72000
  12. 54000
  13. 27000
  14. 80
  15. 52.4
  16. 1500
  17. 40
  18. 40600
  19. 12000
  20. 69790
  21. 68.3
  22. 33.9
  23. 3410
  24. 1400
  25. 20000
  26. 10000
  27. 1800
  28. 50
  29. 48.3
  30. 16000
  31. 28000
  32. 48.1
  33. 61300
  34. 21000
  35. 45.6
  36. 82.1
  37. 1700
  38. 80
  39. 91.7
  40. 24000

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