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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 800 · 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 53.54 to one decimal place. =
  2. 2.Which is closest to 498 × 58? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  3. 3.Which is closest to 899 × 79? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  4. 4.Round 18.27 to one decimal place. =
  5. 5.Which is closest to 3500 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  6. 6.Which is closest to 401 + 500 + 899? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  7. 7.Which is closest to 298 × 71? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  8. 8.Which is closest to 1998 ÷ 39? (a) 25 (b) 500 (c) 50 (d) 100
  9. 9.Which is closest to 795 ÷ 21? (a) 20 (b) 40 (c) 80 (d) 400
  10. 10.Round 16.29 to one decimal place. =
  11. 11.Which is closest to 503 + 403 + 804? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  12. 12.Round 11.67 to one decimal place. =
  13. 13.Round 28935 to the nearest thousand.
  14. 14.Which is closest to 600 × 51? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  15. 15.Round 28123 to the nearest thousand.
  16. 16.Which is closest to 703 × 49? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  17. 17.Which is closest to 1208 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  18. 18.Round 39616 to the nearest hundred.
  19. 19.Round 30956 to the nearest thousand.
  20. 20.Round 85657 to the nearest ten.
  21. 21.Which is closest to 797 + 201 + 304? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  22. 22.Which is closest to 302 + 797 + 404? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  23. 23.Which is closest to 296 × 49? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  24. 24.Round 24850 to the nearest thousand.
  25. 25.Which is closest to 1197 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  26. 26.Which is closest to 502 × 40? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  27. 27.Which is closest to 301 × 50? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  28. 28.Which is closest to 2803 ÷ 41? (a) 70 (b) 140 (c) 35 (d) 700
  29. 29.Which is closest to 404 + 798 + 402? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  30. 30.Round 38544 to the nearest thousand.
  31. 31.Which is closest to 202 × 21? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  32. 32.Which is closest to 1599 ÷ 21? (a) 40 (b) 800 (c) 80 (d) 160
  33. 33.Round 5784 to the nearest hundred.
  34. 34.Which is closest to 397 × 79? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  35. 35.Which is closest to 1799 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  36. 36.Which is closest to 399 × 50? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  37. 37.Which is closest to 397 + 599 + 200? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  38. 38.Which is closest to 104 + 800 + 298? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  39. 39.Round 38.51 to one decimal place. =
  40. 40.Which is closest to 199 + 203 + 198? (a) 600 (b) 800 (c) 700 (d) 500

Answer key

  1. 53.5
  2. 30000
  3. 72000
  4. 18.3
  5. 70
  6. 1800
  7. 21000
  8. 50
  9. 40
  10. 16.3
  11. 1700
  12. 11.7
  13. 29000
  14. 30000
  15. 28000
  16. 35000
  17. 30
  18. 39600
  19. 31000
  20. 85660
  21. 1300
  22. 1500
  23. 15000
  24. 25000
  25. 30
  26. 20000
  27. 15000
  28. 70
  29. 1600
  30. 39000
  31. 4000
  32. 80
  33. 5800
  34. 32000
  35. 90
  36. 20000
  37. 1200
  38. 1200
  39. 38.5
  40. 600

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