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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 609 · 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 993 ÷ 21? (a) 100 (b) 25 (c) 500 (d) 50
  2. 2.Round 78.51 to one decimal place. =
  3. 3.Round 98.94 to one decimal place. =
  4. 4.Round 78.56 to one decimal place. =
  5. 5.Round 18704 to the nearest hundred.
  6. 6.Which is closest to 907 ÷ 31? (a) 60 (b) 15 (c) 30 (d) 300
  7. 7.Which is closest to 896 × 42? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  8. 8.Which is closest to 699 + 499 + 805? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  9. 9.Round 13.33 to one decimal place. =
  10. 10.Round 96773 to the nearest hundred.
  11. 11.Round 32.46 to one decimal place. =
  12. 12.Round 80.48 to one decimal place. =
  13. 13.Round 12.44 to one decimal place. =
  14. 14.Which is closest to 399 + 599 + 105? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  15. 15.Which is closest to 296 × 78? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  16. 16.Which is closest to 802 × 21? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  17. 17.Which is closest to 396 × 39? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  18. 18.Which is closest to 803 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  19. 19.Round 11.27 to one decimal place. =
  20. 20.Which is closest to 1601 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  21. 21.Which is closest to 196 × 42? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  22. 22.Which is closest to 500 × 58? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  23. 23.Which is closest to 497 × 79? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
  24. 24.Which is closest to 2503 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  25. 25.Round 8692 to the nearest hundred.
  26. 26.Which is closest to 599 ÷ 19? (a) 60 (b) 15 (c) 30 (d) 300
  27. 27.Which is closest to 2692 ÷ 29? (a) 90 (b) 180 (c) 45 (d) 900
  28. 28.Round 53183 to the nearest ten.
  29. 29.Round 96.72 to one decimal place. =
  30. 30.Which is closest to 399 × 29? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  31. 31.Which is closest to 98 + 98 + 495? (a) 700 (b) 800 (c) 600 (d) 900
  32. 32.Which is closest to 1994 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
  33. 33.Round 36456 to the nearest ten.
  34. 34.Round 51.23 to one decimal place. =
  35. 35.Which is closest to 600 + 100 + 696? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  36. 36.Which is closest to 1599 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  37. 37.Which is closest to 501 × 50? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  38. 38.Round 48.62 to one decimal place. =
  39. 39.Which is closest to 2391 ÷ 41? (a) 30 (b) 60 (c) 120 (d) 600
  40. 40.Which is closest to 697 × 88? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000

Answer key

  1. 50
  2. 78.5
  3. 98.9
  4. 78.6
  5. 18700
  6. 30
  7. 36000
  8. 2000
  9. 13.3
  10. 96800
  11. 32.5
  12. 80.5
  13. 12.4
  14. 1100
  15. 24000
  16. 16000
  17. 16000
  18. 20
  19. 11.3
  20. 80
  21. 8000
  22. 30000
  23. 40000
  24. 50
  25. 8700
  26. 30
  27. 90
  28. 53180
  29. 96.7
  30. 12000
  31. 700
  32. 50
  33. 36460
  34. 51.2
  35. 1400
  36. 80
  37. 25000
  38. 48.6
  39. 60
  40. 63000

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