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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 410 · 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 13291 to the nearest hundred.
  2. 2.Which is closest to 793 ÷ 39? (a) 200 (b) 10 (c) 20 (d) 40
  3. 3.Round 66975 to the nearest hundred.
  4. 4.Round 19.29 to one decimal place. =
  5. 5.Which is closest to 301 × 30? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
  6. 6.Which is closest to 196 × 79? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  7. 7.Which is closest to 401 + 197 + 302? (a) 1000 (b) 900 (c) 800 (d) 1100
  8. 8.Round 9216 to the nearest ten.
  9. 9.Round 52848 to the nearest thousand.
  10. 10.Which is closest to 196 + 697 + 298? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  11. 11.Which is closest to 202 × 39? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  12. 12.Which is closest to 2707 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  13. 13.Which is closest to 697 + 103 + 396? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  14. 14.Which is closest to 700 × 71? (Round each number first.) (a) 4900 (b) 490000 (c) 49000 (d) 98000
  15. 15.Which is closest to 299 × 20? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  16. 16.Which is closest to 202 × 42? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  17. 17.Round 31.23 to one decimal place. =
  18. 18.Which is closest to 498 × 50? (Round each number first.) (a) 25000 (b) 2500 (c) 50000 (d) 250000
  19. 19.Which is closest to 199 × 22? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
  20. 20.Which is closest to 596 ÷ 31? (a) 200 (b) 10 (c) 20 (d) 40
  21. 21.Which is closest to 604 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  22. 22.Round 90.52 to one decimal place. =
  23. 23.Which is closest to 495 + 96 + 304? (a) 1100 (b) 800 (c) 900 (d) 1000
  24. 24.Which is closest to 603 + 603 + 696? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  25. 25.Which is closest to 1193 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  26. 26.Which is closest to 4000 ÷ 49? (a) 800 (b) 40 (c) 160 (d) 80
  27. 27.Round 59716 to the nearest ten.
  28. 28.Round 81849 to the nearest hundred.
  29. 29.Which is closest to 200 × 42? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  30. 30.Which is closest to 398 + 798 + 104? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  31. 31.Round 86.42 to one decimal place. =
  32. 32.Which is closest to 702 × 82? (Round each number first.) (a) 5600 (b) 112000 (c) 56000 (d) 560000
  33. 33.Round 34.89 to one decimal place. =
  34. 34.Round 72.86 to one decimal place. =
  35. 35.Which is closest to 797 × 42? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  36. 36.Which is closest to 602 ÷ 21? (a) 15 (b) 300 (c) 60 (d) 30
  37. 37.Round 51953 to the nearest hundred.
  38. 38.Round 35.17 to one decimal place. =
  39. 39.Which is closest to 798 + 900 + 296? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  40. 40.Which is closest to 805 + 903 + 198? (a) 2100 (b) 2000 (c) 1800 (d) 1900

Answer key

  1. 13300
  2. 20
  3. 67000
  4. 19.3
  5. 9000
  6. 16000
  7. 900
  8. 9220
  9. 53000
  10. 1200
  11. 8000
  12. 90
  13. 1200
  14. 49000
  15. 6000
  16. 8000
  17. 31.2
  18. 25000
  19. 4000
  20. 20
  21. 30
  22. 90.5
  23. 900
  24. 1900
  25. 60
  26. 80
  27. 59720
  28. 81800
  29. 8000
  30. 1300
  31. 86.4
  32. 56000
  33. 34.9
  34. 72.9
  35. 32000
  36. 30
  37. 52000
  38. 35.2
  39. 2000
  40. 1900

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