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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 117 · 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 92584 to the nearest ten.
  2. 2.Which is closest to 200 × 49? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  3. 3.Which is closest to 803 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  4. 4.Which is closest to 395 + 902 + 604? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  5. 5.Round 57.61 to one decimal place. =
  6. 6.Round 42.23 to one decimal place. =
  7. 7.Which is closest to 601 × 32? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  8. 8.Which is closest to 302 + 699 + 901? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  9. 9.Round 24.51 to one decimal place. =
  10. 10.Round 34.06 to one decimal place. =
  11. 11.Round 77.46 to one decimal place. =
  12. 12.Round 14384 to the nearest hundred.
  13. 13.Round 32.13 to one decimal place. =
  14. 14.Round 20.83 to one decimal place. =
  15. 15.Round 40627 to the nearest hundred.
  16. 16.Round 52.37 to one decimal place. =
  17. 17.Which is closest to 696 × 88? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  18. 18.Which is closest to 400 × 58? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  19. 19.Round 62.16 to one decimal place. =
  20. 20.Which is closest to 398 × 79? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  21. 21.Which is closest to 2395 ÷ 41? (a) 60 (b) 30 (c) 120 (d) 600
  22. 22.Round 24765 to the nearest hundred.
  23. 23.Which is closest to 505 + 199 + 603? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  24. 24.Which is closest to 796 × 80? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  25. 25.Which is closest to 609 ÷ 31? (a) 10 (b) 40 (c) 200 (d) 20
  26. 26.Round 91.57 to one decimal place. =
  27. 27.Which is closest to 303 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  28. 28.Which is closest to 403 × 79? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  29. 29.Which is closest to 296 × 41? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  30. 30.Round 28.44 to one decimal place. =
  31. 31.Round 63409 to the nearest thousand.
  32. 32.Which is closest to 400 + 696 + 796? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  33. 33.Round 55602 to the nearest hundred.
  34. 34.Which is closest to 500 × 81? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  35. 35.Which is closest to 402 + 805 + 205? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  36. 36.Which is closest to 100 + 401 + 697? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  37. 37.Round 93550 to the nearest thousand.
  38. 38.Which is closest to 296 + 302 + 596? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  39. 39.Round 20247 to the nearest ten.
  40. 40.Round 30043 to the nearest hundred.

Answer key

  1. 92580
  2. 10000
  3. 24000
  4. 1900
  5. 57.6
  6. 42.2
  7. 18000
  8. 1900
  9. 24.5
  10. 34.1
  11. 77.5
  12. 14400
  13. 32.1
  14. 20.8
  15. 40600
  16. 52.4
  17. 63000
  18. 24000
  19. 62.2
  20. 32000
  21. 60
  22. 24800
  23. 1300
  24. 64000
  25. 20
  26. 91.6
  27. 18000
  28. 32000
  29. 12000
  30. 28.4
  31. 63000
  32. 1900
  33. 55600
  34. 40000
  35. 1400
  36. 1200
  37. 94000
  38. 1200
  39. 20250
  40. 30000

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