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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 677 · 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 89.44 to one decimal place. =
  2. 2.Which is closest to 698 × 50? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  3. 3.Which is closest to 1197 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  4. 4.Round 23511 to the nearest ten.
  5. 5.Which is closest to 299 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  6. 6.Which is closest to 103 + 505 + 595? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  7. 7.Round 20402 to the nearest ten.
  8. 8.Which is closest to 1191 ÷ 39? (a) 300 (b) 15 (c) 60 (d) 30
  9. 9.Round 10.59 to one decimal place. =
  10. 10.Which is closest to 405 + 899 + 801? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  11. 11.Which is closest to 2004 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  12. 12.Which is closest to 2506 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  13. 13.Which is closest to 503 + 705 + 105? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  14. 14.Round 20.32 to one decimal place. =
  15. 15.Which is closest to 701 × 68? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  16. 16.Which is closest to 200 × 71? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  17. 17.Round 20.27 to one decimal place. =
  18. 18.Round 87236 to the nearest ten.
  19. 19.Which is closest to 1195 ÷ 39? (a) 300 (b) 30 (c) 60 (d) 15
  20. 20.Which is closest to 298 × 50? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  21. 21.Which is closest to 900 + 696 + 595? (a) 2400 (b) 2100 (c) 2200 (d) 2300
  22. 22.Which is closest to 698 × 59? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  23. 23.Which is closest to 899 × 19? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  24. 24.Round 87391 to the nearest ten.
  25. 25.Which is closest to 697 + 103 + 795? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  26. 26.Which is closest to 503 × 38? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  27. 27.Round 37356 to the nearest hundred.
  28. 28.Round 16251 to the nearest ten.
  29. 29.Round 71.23 to one decimal place. =
  30. 30.Round 12966 to the nearest ten.
  31. 31.Which is closest to 404 × 51? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  32. 32.Which is closest to 404 × 18? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  33. 33.Which is closest to 396 × 81? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  34. 34.Which is closest to 2106 ÷ 29? (a) 140 (b) 35 (c) 700 (d) 70
  35. 35.Round 79323 to the nearest hundred.
  36. 36.Which is closest to 2404 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  37. 37.Which is closest to 297 + 604 + 401? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  38. 38.Round 17.29 to one decimal place. =
  39. 39.Which is closest to 798 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  40. 40.Which is closest to 598 × 31? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000

Answer key

  1. 89.4
  2. 35000
  3. 40
  4. 23510
  5. 9000
  6. 1200
  7. 20400
  8. 30
  9. 10.6
  10. 2100
  11. 40
  12. 50
  13. 1300
  14. 20.3
  15. 49000
  16. 14000
  17. 20.3
  18. 87240
  19. 30
  20. 15000
  21. 2200
  22. 42000
  23. 18000
  24. 87390
  25. 1600
  26. 20000
  27. 37400
  28. 16250
  29. 71.2
  30. 12970
  31. 20000
  32. 8000
  33. 32000
  34. 70
  35. 79300
  36. 80
  37. 1300
  38. 17.3
  39. 32000
  40. 18000

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