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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 914 · 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 1499 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  2. 2.Which is closest to 105 + 495 + 299? (a) 800 (b) 900 (c) 1100 (d) 1000
  3. 3.Which is closest to 205 + 495 + 301? (a) 1100 (b) 900 (c) 1200 (d) 1000
  4. 4.Which is closest to 406 ÷ 21? (a) 10 (b) 200 (c) 20 (d) 40
  5. 5.Which is closest to 397 × 30? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  6. 6.Which is closest to 203 × 70? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  7. 7.Which is closest to 403 + 601 + 96? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  8. 8.Which is closest to 2699 ÷ 31? (a) 180 (b) 90 (c) 45 (d) 900
  9. 9.Round 94.54 to one decimal place. =
  10. 10.Round 36.37 to one decimal place. =
  11. 11.Which is closest to 397 × 42? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  12. 12.Round 56946 to the nearest hundred.
  13. 13.Round 27.39 to one decimal place. =
  14. 14.Round 75793 to the nearest thousand.
  15. 15.Which is closest to 196 × 60? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  16. 16.Which is closest to 498 × 50? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  17. 17.Round 64679 to the nearest thousand.
  18. 18.Which is closest to 205 + 596 + 804? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  19. 19.Which is closest to 299 × 38? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  20. 20.Which is closest to 197 × 41? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  21. 21.Which is closest to 802 × 68? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  22. 22.Which is closest to 2395 ÷ 31? (a) 80 (b) 800 (c) 160 (d) 40
  23. 23.Round 39.38 to one decimal place. =
  24. 24.Round 25.31 to one decimal place. =
  25. 25.Round 2196 to the nearest ten.
  26. 26.Which is closest to 104 + 400 + 405? (a) 1100 (b) 800 (c) 1000 (d) 900
  27. 27.Which is closest to 794 ÷ 39? (a) 40 (b) 10 (c) 200 (d) 20
  28. 28.Which is closest to 198 × 38? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  29. 29.Round 91.41 to one decimal place. =
  30. 30.Which is closest to 3495 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  31. 31.Which is closest to 803 × 78? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  32. 32.Round 57274 to the nearest ten.
  33. 33.Which is closest to 3193 ÷ 39? (a) 40 (b) 80 (c) 160 (d) 800
  34. 34.Which is closest to 197 × 49? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  35. 35.Which is closest to 501 × 89? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  36. 36.Which is closest to 696 + 499 + 205? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  37. 37.Round 28.11 to one decimal place. =
  38. 38.Which is closest to 496 × 49? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000
  39. 39.Which is closest to 701 × 70? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
  40. 40.Which is closest to 809 ÷ 41? (a) 20 (b) 10 (c) 40 (d) 200

Answer key

  1. 30
  2. 900
  3. 1000
  4. 20
  5. 12000
  6. 14000
  7. 1100
  8. 90
  9. 94.5
  10. 36.4
  11. 16000
  12. 56900
  13. 27.4
  14. 76000
  15. 12000
  16. 25000
  17. 65000
  18. 1600
  19. 12000
  20. 8000
  21. 56000
  22. 80
  23. 39.4
  24. 25.3
  25. 2200
  26. 900
  27. 20
  28. 8000
  29. 91.4
  30. 70
  31. 64000
  32. 57270
  33. 80
  34. 10000
  35. 45000
  36. 1400
  37. 28.1
  38. 25000
  39. 49000
  40. 20

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