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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 402 · 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 296 + 202 + 204? (a) 800 (b) 600 (c) 900 (d) 700
  2. 2.Which is closest to 299 × 80? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  3. 3.Round 29911 to the nearest hundred.
  4. 4.Round 85.17 to one decimal place. =
  5. 5.Round 7130 to the nearest hundred.
  6. 6.Which is closest to 3207 ÷ 39? (a) 800 (b) 80 (c) 160 (d) 40
  7. 7.Which is closest to 798 + 99 + 98? (a) 900 (b) 1000 (c) 1200 (d) 1100
  8. 8.Which is closest to 401 + 204 + 502? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  9. 9.Which is closest to 4000 ÷ 49? (a) 160 (b) 80 (c) 800 (d) 40
  10. 10.Which is closest to 703 × 18? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  11. 11.Round 89.23 to one decimal place. =
  12. 12.Which is closest to 500 + 205 + 304? (a) 1000 (b) 900 (c) 1200 (d) 1100
  13. 13.Round 93.44 to one decimal place. =
  14. 14.Which is closest to 798 × 38? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  15. 15.Which is closest to 896 × 40? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  16. 16.Round 77.23 to one decimal place. =
  17. 17.Round 28.51 to one decimal place. =
  18. 18.Round 82089 to the nearest ten.
  19. 19.Which is closest to 204 × 31? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  20. 20.Which is closest to 403 × 22? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  21. 21.Which is closest to 203 + 101 + 405? (a) 700 (b) 600 (c) 800 (d) 900
  22. 22.Round 98.11 to one decimal place. =
  23. 23.Round 22.69 to one decimal place. =
  24. 24.Round 26.42 to one decimal place. =
  25. 25.Round 32.72 to one decimal place. =
  26. 26.Round 22.29 to one decimal place. =
  27. 27.Which is closest to 602 × 70? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  28. 28.Which is closest to 498 + 705 + 403? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  29. 29.Which is closest to 798 × 19? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  30. 30.Which is closest to 805 + 102 + 296? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  31. 31.Which is closest to 298 × 58? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  32. 32.Which is closest to 401 × 48? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
  33. 33.Round 62811 to the nearest ten.
  34. 34.Which is closest to 2001 ÷ 39? (a) 50 (b) 25 (c) 500 (d) 100
  35. 35.Which is closest to 407 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  36. 36.Which is closest to 497 × 78? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  37. 37.Which is closest to 1498 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  38. 38.Which is closest to 697 + 396 + 600? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  39. 39.Which is closest to 1195 ÷ 31? (a) 20 (b) 40 (c) 400 (d) 80
  40. 40.Round 68671 to the nearest ten.

Answer key

  1. 700
  2. 24000
  3. 29900
  4. 85.2
  5. 7100
  6. 80
  7. 1000
  8. 1100
  9. 80
  10. 14000
  11. 89.2
  12. 1000
  13. 93.4
  14. 32000
  15. 36000
  16. 77.2
  17. 28.5
  18. 82090
  19. 6000
  20. 8000
  21. 700
  22. 98.1
  23. 22.7
  24. 26.4
  25. 32.7
  26. 22.3
  27. 42000
  28. 1600
  29. 16000
  30. 1200
  31. 18000
  32. 20000
  33. 62810
  34. 50
  35. 20
  36. 40000
  37. 50
  38. 1700
  39. 40
  40. 68670

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