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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 164 · 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 803 × 52? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  2. 2.Which is closest to 201 × 69? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  3. 3.Which is closest to 801 + 195 + 95? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  4. 4.Which is closest to 499 + 202 + 303? (a) 900 (b) 1100 (c) 1000 (d) 1200
  5. 5.Round 10.77 to one decimal place. =
  6. 6.Which is closest to 596 × 29? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  7. 7.Which is closest to 704 × 92? (Round each number first.) (a) 63000 (b) 6300 (c) 630000 (d) 126000
  8. 8.Round 22.72 to one decimal place. =
  9. 9.Which is closest to 196 + 701 + 95? (a) 1200 (b) 900 (c) 1000 (d) 1100
  10. 10.Which is closest to 2405 ÷ 31? (a) 800 (b) 80 (c) 40 (d) 160
  11. 11.Which is closest to 603 × 48? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  12. 12.Which is closest to 1196 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
  13. 13.Which is closest to 396 × 40? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  14. 14.Round 71856 to the nearest ten.
  15. 15.Round 24592 to the nearest thousand.
  16. 16.Round 32.59 to one decimal place. =
  17. 17.Which is closest to 608 ÷ 31? (a) 40 (b) 20 (c) 10 (d) 200
  18. 18.Round 18.21 to one decimal place. =
  19. 19.Which is closest to 1007 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
  20. 20.Which is closest to 1794 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  21. 21.Which is closest to 2106 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  22. 22.Round 90.47 to one decimal place. =
  23. 23.Which is closest to 1600 ÷ 39? (a) 40 (b) 20 (c) 400 (d) 80
  24. 24.Round 10.44 to one decimal place. =
  25. 25.Which is closest to 800 + 801 + 201? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  26. 26.Round 10183 to the nearest hundred.
  27. 27.Which is closest to 198 + 696 + 399? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  28. 28.Round 49.56 to one decimal place. =
  29. 29.Which is closest to 699 × 78? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  30. 30.Round 77.48 to one decimal place. =
  31. 31.Which is closest to 297 + 103 + 401? (a) 1000 (b) 700 (c) 900 (d) 800
  32. 32.Which is closest to 1992 ÷ 41? (a) 100 (b) 50 (c) 25 (d) 500
  33. 33.Round 17.58 to one decimal place. =
  34. 34.Round 32826 to the nearest ten.
  35. 35.Which is closest to 1592 ÷ 41? (a) 400 (b) 80 (c) 20 (d) 40
  36. 36.Round 53.47 to one decimal place. =
  37. 37.Round 69.27 to one decimal place. =
  38. 38.Round 37.27 to one decimal place. =
  39. 39.Which is closest to 1391 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  40. 40.Which is closest to 197 + 405 + 697? (a) 1400 (b) 1200 (c) 1300 (d) 1500

Answer key

  1. 40000
  2. 14000
  3. 1100
  4. 1000
  5. 10.8
  6. 18000
  7. 63000
  8. 22.7
  9. 1000
  10. 80
  11. 30000
  12. 40
  13. 16000
  14. 71860
  15. 25000
  16. 32.6
  17. 20
  18. 18.2
  19. 50
  20. 60
  21. 70
  22. 90.5
  23. 40
  24. 10.4
  25. 1800
  26. 10200
  27. 1300
  28. 49.6
  29. 56000
  30. 77.5
  31. 800
  32. 50
  33. 17.6
  34. 32830
  35. 40
  36. 53.5
  37. 69.3
  38. 37.3
  39. 70
  40. 1300

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