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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 142 · 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 299 + 198 + 497? (a) 900 (b) 1100 (c) 1000 (d) 1200
  2. 2.Which is closest to 202 × 38? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  3. 3.Which is closest to 900 × 21? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  4. 4.Round 23489 to the nearest hundred.
  5. 5.Which is closest to 902 × 78? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  6. 6.Round 78936 to the nearest thousand.
  7. 7.Which is closest to 696 + 500 + 201? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  8. 8.Which is closest to 597 × 72? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
  9. 9.Which is closest to 400 × 78? (Round each number first.) (a) 32000 (b) 320000 (c) 64000 (d) 3200
  10. 10.Round 72.92 to one decimal place. =
  11. 11.Round 33.91 to one decimal place. =
  12. 12.Round 46.29 to one decimal place. =
  13. 13.Which is closest to 1494 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  14. 14.Round 90886 to the nearest ten.
  15. 15.Round 11889 to the nearest ten.
  16. 16.Round 18884 to the nearest ten.
  17. 17.Round 73.36 to one decimal place. =
  18. 18.Which is closest to 301 × 49? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  19. 19.Which is closest to 802 + 395 + 497? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  20. 20.Which is closest to 297 × 50? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  21. 21.Round 92.23 to one decimal place. =
  22. 22.Which is closest to 204 × 20? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  23. 23.Round 43.28 to one decimal place. =
  24. 24.Which is closest to 297 × 81? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  25. 25.Which is closest to 697 + 802 + 902? (a) 2300 (b) 2600 (c) 2500 (d) 2400
  26. 26.Which is closest to 397 × 81? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  27. 27.Which is closest to 1403 ÷ 19? (a) 140 (b) 35 (c) 70 (d) 700
  28. 28.Which is closest to 201 × 61? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  29. 29.Round 63841 to the nearest hundred.
  30. 30.Which is closest to 95 + 200 + 397? (a) 900 (b) 700 (c) 800 (d) 600
  31. 31.Round 6078 to the nearest hundred.
  32. 32.Round 83311 to the nearest thousand.
  33. 33.Round 32854 to the nearest thousand.
  34. 34.Which is closest to 2409 ÷ 29? (a) 800 (b) 80 (c) 40 (d) 160
  35. 35.Which is closest to 300 × 19? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  36. 36.Which is closest to 95 + 96 + 295? (a) 500 (b) 600 (c) 400 (d) 700
  37. 37.Which is closest to 408 ÷ 19? (a) 10 (b) 20 (c) 40 (d) 200
  38. 38.Which is closest to 3504 ÷ 51? (a) 35 (b) 140 (c) 70 (d) 700
  39. 39.Which is closest to 201 + 902 + 897? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  40. 40.Round 45.11 to one decimal place. =

Answer key

  1. 1000
  2. 8000
  3. 18000
  4. 23500
  5. 72000
  6. 79000
  7. 1400
  8. 42000
  9. 32000
  10. 72.9
  11. 33.9
  12. 46.3
  13. 30
  14. 90890
  15. 11890
  16. 18880
  17. 73.4
  18. 15000
  19. 1700
  20. 15000
  21. 92.2
  22. 4000
  23. 43.3
  24. 24000
  25. 2400
  26. 32000
  27. 70
  28. 12000
  29. 63800
  30. 700
  31. 6100
  32. 83000
  33. 33000
  34. 80
  35. 6000
  36. 500
  37. 20
  38. 70
  39. 2000
  40. 45.1

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