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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 424 · 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 10.47 to one decimal place. =
  2. 2.Which is closest to 100 + 95 + 804? (a) 1200 (b) 1100 (c) 1000 (d) 900
  3. 3.Which is closest to 96 + 198 + 795? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  4. 4.Round 10.32 to one decimal place. =
  5. 5.Round 53.52 to one decimal place. =
  6. 6.Which is closest to 202 × 79? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  7. 7.Which is closest to 199 × 38? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  8. 8.Which is closest to 198 × 62? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  9. 9.Round 82.76 to one decimal place. =
  10. 10.Round 3466 to the nearest ten.
  11. 11.Round 32.74 to one decimal place. =
  12. 12.Which is closest to 1795 ÷ 21? (a) 900 (b) 90 (c) 45 (d) 180
  13. 13.Round 93124 to the nearest ten.
  14. 14.Which is closest to 1796 ÷ 21? (a) 900 (b) 45 (c) 180 (d) 90
  15. 15.Which is closest to 603 × 71? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  16. 16.Which is closest to 799 × 88? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  17. 17.Which is closest to 801 + 195 + 801? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  18. 18.Which is closest to 299 × 40? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  19. 19.Round 41831 to the nearest thousand.
  20. 20.Which is closest to 299 × 30? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  21. 21.Which is closest to 295 + 600 + 796? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  22. 22.Which is closest to 198 × 50? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  23. 23.Which is closest to 2505 ÷ 51? (a) 100 (b) 50 (c) 25 (d) 500
  24. 24.Which is closest to 399 × 70? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
  25. 25.Which is closest to 201 × 72? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  26. 26.Round 17020 to the nearest hundred.
  27. 27.Which is closest to 602 ÷ 19? (a) 300 (b) 30 (c) 15 (d) 60
  28. 28.Round 84649 to the nearest ten.
  29. 29.Which is closest to 201 + 395 + 903? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  30. 30.Which is closest to 1193 ÷ 19? (a) 60 (b) 600 (c) 30 (d) 120
  31. 31.Round 20503 to the nearest thousand.
  32. 32.Which is closest to 102 + 498 + 800? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  33. 33.Round 24256 to the nearest ten.
  34. 34.Which is closest to 1796 ÷ 29? (a) 30 (b) 120 (c) 600 (d) 60
  35. 35.Which is closest to 202 × 30? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  36. 36.Round 94.84 to one decimal place. =
  37. 37.Round 47198 to the nearest hundred.
  38. 38.Which is closest to 598 × 80? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  39. 39.Round 45168 to the nearest ten.
  40. 40.Which is closest to 902 × 89? (Round each number first.) (a) 162000 (b) 8100 (c) 81000 (d) 810000

Answer key

  1. 10.5
  2. 1000
  3. 1100
  4. 10.3
  5. 53.5
  6. 16000
  7. 8000
  8. 12000
  9. 82.8
  10. 3470
  11. 32.7
  12. 90
  13. 93120
  14. 90
  15. 42000
  16. 72000
  17. 1800
  18. 12000
  19. 42000
  20. 9000
  21. 1700
  22. 10000
  23. 50
  24. 28000
  25. 14000
  26. 17000
  27. 30
  28. 84650
  29. 1500
  30. 60
  31. 21000
  32. 1400
  33. 24260
  34. 60
  35. 6000
  36. 94.8
  37. 47200
  38. 48000
  39. 45170
  40. 81000

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