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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 274 · 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 37340 to the nearest hundred.
  2. 2.Which is closest to 301 × 59? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  3. 3.Round 61087 to the nearest thousand.
  4. 4.Round 23641 to the nearest ten.
  5. 5.Which is closest to 302 × 30? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  6. 6.Which is closest to 704 × 18? (Round each number first.) (a) 28000 (b) 14000 (c) 140000 (d) 1400
  7. 7.Which is closest to 2006 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  8. 8.Round 80154 to the nearest hundred.
  9. 9.Which is closest to 304 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  10. 10.Round 47.36 to one decimal place. =
  11. 11.Round 73606 to the nearest thousand.
  12. 12.Which is closest to 1004 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  13. 13.Which is closest to 703 + 496 + 103? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  14. 14.Round 41.67 to one decimal place. =
  15. 15.Which is closest to 3596 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900
  16. 16.Round 31.74 to one decimal place. =
  17. 17.Round 19283 to the nearest hundred.
  18. 18.Which is closest to 604 ÷ 19? (a) 300 (b) 15 (c) 30 (d) 60
  19. 19.Which is closest to 901 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  20. 20.Which is closest to 903 × 18? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  21. 21.Round 60208 to the nearest thousand.
  22. 22.Which is closest to 802 + 402 + 596? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  23. 23.Round 31.27 to one decimal place. =
  24. 24.Which is closest to 4496 ÷ 51? (a) 900 (b) 45 (c) 90 (d) 180
  25. 25.Round 37.28 to one decimal place. =
  26. 26.Round 86057 to the nearest thousand.
  27. 27.Round 22223 to the nearest ten.
  28. 28.Round 13603 to the nearest thousand.
  29. 29.Which is closest to 302 × 92? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  30. 30.Which is closest to 398 + 400 + 802? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  31. 31.Round 4279 to the nearest ten.
  32. 32.Which is closest to 3495 ÷ 49? (a) 35 (b) 140 (c) 70 (d) 700
  33. 33.Round 86.42 to one decimal place. =
  34. 34.Which is closest to 499 + 297 + 301? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  35. 35.Which is closest to 806 ÷ 19? (a) 400 (b) 40 (c) 80 (d) 20
  36. 36.Which is closest to 402 × 49? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  37. 37.Which is closest to 496 × 30? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  38. 38.Which is closest to 496 × 22? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  39. 39.Which is closest to 899 + 401 + 298? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  40. 40.Round 27128 to the nearest ten.

Answer key

  1. 37300
  2. 18000
  3. 61000
  4. 23640
  5. 9000
  6. 14000
  7. 40
  8. 80200
  9. 6000
  10. 47.4
  11. 74000
  12. 20
  13. 1300
  14. 41.7
  15. 90
  16. 31.7
  17. 19300
  18. 30
  19. 30
  20. 18000
  21. 60000
  22. 1800
  23. 31.3
  24. 90
  25. 37.3
  26. 86000
  27. 22220
  28. 14000
  29. 27000
  30. 1600
  31. 4280
  32. 70
  33. 86.4
  34. 1100
  35. 40
  36. 20000
  37. 15000
  38. 10000
  39. 1600
  40. 27130

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