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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 358 · 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 803 × 90? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  2. 2.Round 10528 to the nearest hundred.
  3. 3.Which is closest to 600 ÷ 19? (a) 30 (b) 15 (c) 60 (d) 300
  4. 4.Which is closest to 2103 ÷ 29? (a) 70 (b) 35 (c) 140 (d) 700
  5. 5.Which is closest to 604 ÷ 29? (a) 10 (b) 200 (c) 20 (d) 40
  6. 6.Round 14.43 to one decimal place. =
  7. 7.Which is closest to 1400 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  8. 8.Round 15.69 to one decimal place. =
  9. 9.Which is closest to 197 × 88? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  10. 10.Which is closest to 892 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  11. 11.Which is closest to 601 × 91? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  12. 12.Which is closest to 1398 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  13. 13.Round 49689 to the nearest ten.
  14. 14.Which is closest to 2991 ÷ 51? (a) 30 (b) 120 (c) 60 (d) 600
  15. 15.Which is closest to 97 + 898 + 200? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  16. 16.Round 11496 to the nearest ten.
  17. 17.Which is closest to 496 × 32? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  18. 18.Round 22945 to the nearest hundred.
  19. 19.Round 43.41 to one decimal place. =
  20. 20.Round 87.13 to one decimal place. =
  21. 21.Which is closest to 601 × 18? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  22. 22.Which is closest to 897 + 395 + 399? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  23. 23.Round 51441 to the nearest hundred.
  24. 24.Round 47.64 to one decimal place. =
  25. 25.Round 55.08 to one decimal place. =
  26. 26.Which is closest to 609 ÷ 19? (a) 60 (b) 300 (c) 30 (d) 15
  27. 27.Which is closest to 299 × 71? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  28. 28.Which is closest to 398 ÷ 21? (a) 40 (b) 10 (c) 200 (d) 20
  29. 29.Which is closest to 197 × 28? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  30. 30.Which is closest to 604 + 895 + 901? (a) 2400 (b) 2300 (c) 2600 (d) 2500
  31. 31.Which is closest to 499 × 80? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  32. 32.Which is closest to 402 × 18? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  33. 33.Which is closest to 792 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  34. 34.Which is closest to 900 + 398 + 403? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  35. 35.Which is closest to 2403 ÷ 29? (a) 40 (b) 160 (c) 800 (d) 80
  36. 36.Round 72614 to the nearest ten.
  37. 37.Which is closest to 699 × 92? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  38. 38.Which is closest to 195 + 195 + 697? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  39. 39.Round 50173 to the nearest thousand.
  40. 40.Which is closest to 198 + 496 + 900? (a) 1700 (b) 1800 (c) 1600 (d) 1500

Answer key

  1. 72000
  2. 10500
  3. 30
  4. 70
  5. 20
  6. 14.4
  7. 70
  8. 15.7
  9. 18000
  10. 30
  11. 54000
  12. 70
  13. 49690
  14. 60
  15. 1200
  16. 11500
  17. 15000
  18. 22900
  19. 43.4
  20. 87.1
  21. 12000
  22. 1700
  23. 51400
  24. 47.6
  25. 55.1
  26. 30
  27. 21000
  28. 20
  29. 6000
  30. 2400
  31. 40000
  32. 8000
  33. 40
  34. 1700
  35. 80
  36. 72610
  37. 63000
  38. 1100
  39. 50000
  40. 1600

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