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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 442 · 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 + 199 + 905? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  2. 2.Which is closest to 696 × 70? (Round each number first.) (a) 490000 (b) 49000 (c) 98000 (d) 4900
  3. 3.Which is closest to 898 + 600 + 900? (a) 2300 (b) 2500 (c) 2600 (d) 2400
  4. 4.Which is closest to 899 × 72? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  5. 5.Round 98.07 to one decimal place. =
  6. 6.Which is closest to 896 + 403 + 397? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  7. 7.Round 73.56 to one decimal place. =
  8. 8.Round 13.47 to one decimal place. =
  9. 9.Which is closest to 1595 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  10. 10.Round 16.38 to one decimal place. =
  11. 11.Which is closest to 98 + 101 + 303? (a) 400 (b) 500 (c) 700 (d) 600
  12. 12.Round 90567 to the nearest thousand.
  13. 13.Round 79.34 to one decimal place. =
  14. 14.Which is closest to 599 × 61? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  15. 15.Which is closest to 993 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  16. 16.Which is closest to 301 × 92? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  17. 17.Which is closest to 1395 ÷ 21? (a) 70 (b) 140 (c) 700 (d) 35
  18. 18.Which is closest to 1204 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
  19. 19.Which is closest to 3195 ÷ 41? (a) 80 (b) 40 (c) 800 (d) 160
  20. 20.Round 84274 to the nearest thousand.
  21. 21.Round 19.61 to one decimal place. =
  22. 22.Round 4613 to the nearest ten.
  23. 23.Which is closest to 196 + 399 + 97? (a) 700 (b) 800 (c) 600 (d) 900
  24. 24.Which is closest to 400 × 19? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  25. 25.Which is closest to 2692 ÷ 31? (a) 180 (b) 90 (c) 45 (d) 900
  26. 26.Which is closest to 800 × 31? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  27. 27.Which is closest to 704 + 202 + 201? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  28. 28.Which is closest to 399 × 88? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  29. 29.Round 48544 to the nearest ten.
  30. 30.Which is closest to 600 × 18? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  31. 31.Round 32121 to the nearest thousand.
  32. 32.Which is closest to 298 × 59? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  33. 33.Which is closest to 897 + 305 + 99? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  34. 34.Round 15486 to the nearest ten.
  35. 35.Round 53697 to the nearest ten.
  36. 36.Round 21.51 to one decimal place. =
  37. 37.Round 21.56 to one decimal place. =
  38. 38.Round 8963 to the nearest ten.
  39. 39.Which is closest to 302 × 78? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  40. 40.Which is closest to 2099 ÷ 29? (a) 35 (b) 700 (c) 70 (d) 140

Answer key

  1. 1500
  2. 49000
  3. 2400
  4. 63000
  5. 98.1
  6. 1700
  7. 73.6
  8. 13.5
  9. 40
  10. 16.4
  11. 500
  12. 91000
  13. 79.3
  14. 36000
  15. 50
  16. 27000
  17. 70
  18. 60
  19. 80
  20. 84000
  21. 19.6
  22. 4610
  23. 700
  24. 8000
  25. 90
  26. 24000
  27. 1100
  28. 36000
  29. 48540
  30. 12000
  31. 32000
  32. 18000
  33. 1300
  34. 15490
  35. 53700
  36. 21.5
  37. 21.6
  38. 8960
  39. 24000
  40. 70

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