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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 169 · 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 704 × 61? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  2. 2.Which is closest to 396 × 29? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  3. 3.Which is closest to 603 + 501 + 497? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  4. 4.Round 12.47 to one decimal place. =
  5. 5.Which is closest to 197 + 305 + 199? (a) 900 (b) 700 (c) 600 (d) 800
  6. 6.Which is closest to 899 × 51? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  7. 7.Which is closest to 400 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  8. 8.Which is closest to 401 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  9. 9.Which is closest to 1991 ÷ 39? (a) 100 (b) 25 (c) 50 (d) 500
  10. 10.Which is closest to 199 + 503 + 205? (a) 1100 (b) 900 (c) 800 (d) 1000
  11. 11.Which is closest to 298 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  12. 12.Round 79.68 to one decimal place. =
  13. 13.Which is closest to 303 × 19? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  14. 14.Which is closest to 3504 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  15. 15.Round 96892 to the nearest thousand.
  16. 16.Which is closest to 1998 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
  17. 17.Which is closest to 1193 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  18. 18.Which is closest to 1001 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  19. 19.Round 55.07 to one decimal place. =
  20. 20.Which is closest to 3495 ÷ 51? (a) 70 (b) 35 (c) 700 (d) 140
  21. 21.Which is closest to 98 + 102 + 701? (a) 800 (b) 900 (c) 1100 (d) 1000
  22. 22.Which is closest to 598 + 195 + 903? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  23. 23.Round 47.74 to one decimal place. =
  24. 24.Round 91494 to the nearest ten.
  25. 25.Which is closest to 2692 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  26. 26.Round 81.39 to one decimal place. =
  27. 27.Round 31.68 to one decimal place. =
  28. 28.Which is closest to 501 × 41? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  29. 29.Which is closest to 1394 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  30. 30.Which is closest to 803 × 51? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  31. 31.Round 46.42 to one decimal place. =
  32. 32.Round 19783 to the nearest hundred.
  33. 33.Round 87947 to the nearest thousand.
  34. 34.Which is closest to 305 + 196 + 798? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  35. 35.Round 11066 to the nearest hundred.
  36. 36.Round 44.26 to one decimal place. =
  37. 37.Round 88628 to the nearest hundred.
  38. 38.Round 71668 to the nearest thousand.
  39. 39.Which is closest to 501 + 701 + 798? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  40. 40.Which is closest to 904 + 99 + 897? (a) 1800 (b) 1900 (c) 2000 (d) 2100

Answer key

  1. 42000
  2. 12000
  3. 1600
  4. 12.5
  5. 700
  6. 45000
  7. 12000
  8. 8000
  9. 50
  10. 900
  11. 6000
  12. 79.7
  13. 6000
  14. 70
  15. 97000
  16. 40
  17. 60
  18. 20
  19. 55.1
  20. 70
  21. 900
  22. 1700
  23. 47.7
  24. 91490
  25. 90
  26. 81.4
  27. 31.7
  28. 20000
  29. 70
  30. 40000
  31. 46.4
  32. 19800
  33. 88000
  34. 1300
  35. 11100
  36. 44.3
  37. 88600
  38. 72000
  39. 2000
  40. 1900

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