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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 991 · 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 297 × 70? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  2. 2.Which is closest to 607 ÷ 21? (a) 60 (b) 30 (c) 300 (d) 15
  3. 3.Round 62259 to the nearest hundred.
  4. 4.Which is closest to 596 + 96 + 902? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  5. 5.Which is closest to 1201 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600
  6. 6.Round 26.36 to one decimal place. =
  7. 7.Round 31.72 to one decimal place. =
  8. 8.Round 21438 to the nearest thousand.
  9. 9.Which is closest to 300 × 22? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  10. 10.Which is closest to 504 + 603 + 104? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  11. 11.Which is closest to 198 × 90? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  12. 12.Round 15657 to the nearest hundred.
  13. 13.Round 16.31 to one decimal place. =
  14. 14.Which is closest to 898 × 52? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  15. 15.Round 33.84 to one decimal place. =
  16. 16.Round 69.16 to one decimal place. =
  17. 17.Which is closest to 1999 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  18. 18.Round 76432 to the nearest hundred.
  19. 19.Round 93322 to the nearest thousand.
  20. 20.Which is closest to 2393 ÷ 31? (a) 800 (b) 40 (c) 80 (d) 160
  21. 21.Which is closest to 3999 ÷ 49? (a) 800 (b) 160 (c) 80 (d) 40
  22. 22.Round 63.18 to one decimal place. =
  23. 23.Which is closest to 499 × 82? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  24. 24.Which is closest to 299 + 905 + 502? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  25. 25.Round 53.12 to one decimal place. =
  26. 26.Which is closest to 795 ÷ 19? (a) 40 (b) 400 (c) 80 (d) 20
  27. 27.Round 71.42 to one decimal place. =
  28. 28.Which is closest to 301 + 200 + 203? (a) 600 (b) 900 (c) 800 (d) 700
  29. 29.Round 75.26 to one decimal place. =
  30. 30.Round 23.31 to one decimal place. =
  31. 31.Which is closest to 594 ÷ 19? (a) 30 (b) 300 (c) 60 (d) 15
  32. 32.Round 17722 to the nearest ten.
  33. 33.Round 95854 to the nearest thousand.
  34. 34.Which is closest to 501 + 804 + 697? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  35. 35.Which is closest to 903 + 696 + 604? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  36. 36.Round 88463 to the nearest hundred.
  37. 37.Round 25.68 to one decimal place. =
  38. 38.Round 67.84 to one decimal place. =
  39. 39.Which is closest to 604 ÷ 19? (a) 30 (b) 60 (c) 300 (d) 15
  40. 40.Which is closest to 197 × 69? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400

Answer key

  1. 21000
  2. 30
  3. 62300
  4. 1600
  5. 60
  6. 26.4
  7. 31.7
  8. 21000
  9. 6000
  10. 1200
  11. 18000
  12. 15700
  13. 16.3
  14. 45000
  15. 33.8
  16. 69.2
  17. 50
  18. 76400
  19. 93000
  20. 80
  21. 80
  22. 63.2
  23. 40000
  24. 1700
  25. 53.1
  26. 40
  27. 71.4
  28. 700
  29. 75.3
  30. 23.3
  31. 30
  32. 17720
  33. 96000
  34. 2000
  35. 2200
  36. 88500
  37. 25.7
  38. 67.8
  39. 30
  40. 14000

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