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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 418 · 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 595 + 404 + 505? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  2. 2.Which is closest to 195 + 196 + 96? (a) 600 (b) 700 (c) 500 (d) 400
  3. 3.Which is closest to 398 × 58? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  4. 4.Round 45.63 to one decimal place. =
  5. 5.Which is closest to 202 + 598 + 197? (a) 1000 (b) 1200 (c) 1100 (d) 900
  6. 6.Which is closest to 703 × 21? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  7. 7.Which is closest to 599 × 38? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  8. 8.Which is closest to 298 × 48? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  9. 9.Round 90.08 to one decimal place. =
  10. 10.Which is closest to 1406 ÷ 19? (a) 140 (b) 35 (c) 70 (d) 700
  11. 11.Round 91638 to the nearest hundred.
  12. 12.Which is closest to 1394 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  13. 13.Which is closest to 800 × 52? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000
  14. 14.Which is closest to 203 + 800 + 804? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  15. 15.Which is closest to 796 ÷ 39? (a) 20 (b) 10 (c) 200 (d) 40
  16. 16.Round 92.64 to one decimal place. =
  17. 17.Which is closest to 1005 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  18. 18.Which is closest to 703 + 296 + 902? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  19. 19.Which is closest to 695 + 505 + 397? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  20. 20.Which is closest to 495 + 298 + 797? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  21. 21.Which is closest to 701 × 30? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  22. 22.Which is closest to 197 × 38? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  23. 23.Round 40884 to the nearest ten.
  24. 24.Which is closest to 905 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  25. 25.Round 89710 to the nearest thousand.
  26. 26.Round 23718 to the nearest thousand.
  27. 27.Which is closest to 1198 ÷ 29? (a) 80 (b) 20 (c) 400 (d) 40
  28. 28.Which is closest to 3604 ÷ 39? (a) 900 (b) 180 (c) 45 (d) 90
  29. 29.Which is closest to 695 + 802 + 195? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  30. 30.Which is closest to 197 × 70? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  31. 31.Which is closest to 600 + 895 + 895? (a) 2400 (b) 2500 (c) 2300 (d) 2600
  32. 32.Which is closest to 396 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  33. 33.Which is closest to 398 × 39? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  34. 34.Round 7228 to the nearest hundred.
  35. 35.Which is closest to 2996 ÷ 51? (a) 600 (b) 30 (c) 60 (d) 120
  36. 36.Round 40.13 to one decimal place. =
  37. 37.Which is closest to 791 ÷ 21? (a) 40 (b) 80 (c) 400 (d) 20
  38. 38.Which is closest to 396 × 52? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  39. 39.Which is closest to 101 + 499 + 205? (a) 900 (b) 700 (c) 1000 (d) 800
  40. 40.Round 41.23 to one decimal place. =

Answer key

  1. 1500
  2. 500
  3. 24000
  4. 45.6
  5. 1000
  6. 14000
  7. 24000
  8. 15000
  9. 90.1
  10. 70
  11. 91600
  12. 70
  13. 40000
  14. 1800
  15. 20
  16. 92.6
  17. 20
  18. 1900
  19. 1600
  20. 1600
  21. 21000
  22. 8000
  23. 40880
  24. 30
  25. 90000
  26. 24000
  27. 40
  28. 90
  29. 1700
  30. 14000
  31. 2400
  32. 16000
  33. 16000
  34. 7200
  35. 60
  36. 40.1
  37. 40
  38. 20000
  39. 800
  40. 41.2

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