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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 345 · 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 901 × 58? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  2. 2.Which is closest to 804 + 200 + 598? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  3. 3.Round 40077 to the nearest ten.
  4. 4.Round 54.38 to one decimal place. =
  5. 5.Which is closest to 1599 ÷ 41? (a) 40 (b) 400 (c) 80 (d) 20
  6. 6.Which is closest to 2993 ÷ 49? (a) 600 (b) 120 (c) 60 (d) 30
  7. 7.Which is closest to 1495 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  8. 8.Which is closest to 105 + 504 + 700? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  9. 9.Which is closest to 602 + 204 + 899? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  10. 10.Round 20438 to the nearest ten.
  11. 11.Which is closest to 798 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  12. 12.Round 45160 to the nearest hundred.
  13. 13.Which is closest to 4495 ÷ 51? (a) 180 (b) 900 (c) 45 (d) 90
  14. 14.Which is closest to 299 + 699 + 502? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  15. 15.Which is closest to 3607 ÷ 41? (a) 45 (b) 900 (c) 90 (d) 180
  16. 16.Which is closest to 496 × 42? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
  17. 17.Which is closest to 4492 ÷ 49? (a) 180 (b) 45 (c) 900 (d) 90
  18. 18.Which is closest to 102 + 97 + 802? (a) 1000 (b) 1200 (c) 1100 (d) 900
  19. 19.Which is closest to 397 + 605 + 905? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  20. 20.Which is closest to 500 + 703 + 196? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  21. 21.Which is closest to 402 × 21? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  22. 22.Which is closest to 3993 ÷ 51? (a) 40 (b) 80 (c) 160 (d) 800
  23. 23.Which is closest to 2803 ÷ 39? (a) 140 (b) 35 (c) 70 (d) 700
  24. 24.Round 8073 to the nearest thousand.
  25. 25.Round 29.47 to one decimal place. =
  26. 26.Round 28649 to the nearest ten.
  27. 27.Which is closest to 1206 ÷ 31? (a) 20 (b) 80 (c) 400 (d) 40
  28. 28.Which is closest to 598 + 499 + 505? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  29. 29.Which is closest to 1494 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  30. 30.Round 31.42 to one decimal place. =
  31. 31.Which is closest to 898 + 397 + 104? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  32. 32.Which is closest to 800 × 78? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  33. 33.Which is closest to 901 × 48? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  34. 34.Which is closest to 499 × 92? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  35. 35.Which is closest to 897 × 70? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  36. 36.Which is closest to 199 + 704 + 595? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  37. 37.Round 89826 to the nearest ten.
  38. 38.Which is closest to 699 × 79? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  39. 39.Which is closest to 903 × 91? (Round each number first.) (a) 81000 (b) 810000 (c) 8100 (d) 162000
  40. 40.Round 19.32 to one decimal place. =

Answer key

  1. 54000
  2. 1600
  3. 40080
  4. 54.4
  5. 40
  6. 60
  7. 30
  8. 1300
  9. 1700
  10. 20440
  11. 20
  12. 45200
  13. 90
  14. 1500
  15. 90
  16. 20000
  17. 90
  18. 1000
  19. 1900
  20. 1400
  21. 8000
  22. 80
  23. 70
  24. 8000
  25. 29.5
  26. 28650
  27. 40
  28. 1600
  29. 50
  30. 31.4
  31. 1400
  32. 64000
  33. 45000
  34. 45000
  35. 63000
  36. 1500
  37. 89830
  38. 56000
  39. 81000
  40. 19.3

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