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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 778 · 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 399 × 71? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  2. 2.Which is closest to 899 × 19? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  3. 3.Round 97.24 to one decimal place. =
  4. 4.Which is closest to 399 × 48? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  5. 5.Round 93446 to the nearest hundred.
  6. 6.Which is closest to 196 + 397 + 599? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  7. 7.Round 56.09 to one decimal place. =
  8. 8.Round 99078 to the nearest thousand.
  9. 9.Round 50879 to the nearest ten.
  10. 10.Round 70.18 to one decimal place. =
  11. 11.Which is closest to 296 + 495 + 795? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  12. 12.Round 69277 to the nearest thousand.
  13. 13.Which is closest to 502 + 402 + 901? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  14. 14.Which is closest to 2391 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
  15. 15.Round 98067 to the nearest thousand.
  16. 16.Which is closest to 1004 ÷ 51? (a) 10 (b) 40 (c) 20 (d) 200
  17. 17.Round 60354 to the nearest ten.
  18. 18.Which is closest to 198 × 82? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  19. 19.Which is closest to 895 + 795 + 204? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  20. 20.Which is closest to 403 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  21. 21.Which is closest to 2692 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  22. 22.Which is closest to 496 × 32? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  23. 23.Round 56.19 to one decimal place. =
  24. 24.Round 34.46 to one decimal place. =
  25. 25.Which is closest to 398 × 20? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  26. 26.Which is closest to 2801 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
  27. 27.Which is closest to 397 × 58? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  28. 28.Which is closest to 703 + 897 + 95? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  29. 29.Round 53940 to the nearest hundred.
  30. 30.Which is closest to 597 × 40? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  31. 31.Which is closest to 295 + 701 + 100? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  32. 32.Which is closest to 796 × 81? (Round each number first.) (a) 64000 (b) 6400 (c) 640000 (d) 128000
  33. 33.Round 36957 to the nearest hundred.
  34. 34.Which is closest to 392 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  35. 35.Which is closest to 502 × 71? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  36. 36.Which is closest to 803 × 28? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  37. 37.Which is closest to 496 × 29? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  38. 38.Which is closest to 2398 ÷ 31? (a) 80 (b) 800 (c) 160 (d) 40
  39. 39.Which is closest to 202 × 90? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  40. 40.Which is closest to 795 + 605 + 95? (a) 1500 (b) 1400 (c) 1700 (d) 1600

Answer key

  1. 28000
  2. 18000
  3. 97.2
  4. 20000
  5. 93400
  6. 1200
  7. 56.1
  8. 99000
  9. 50880
  10. 70.2
  11. 1600
  12. 69000
  13. 1800
  14. 80
  15. 98000
  16. 20
  17. 60350
  18. 16000
  19. 1900
  20. 20
  21. 90
  22. 15000
  23. 56.2
  24. 34.5
  25. 8000
  26. 70
  27. 24000
  28. 1700
  29. 53900
  30. 24000
  31. 1100
  32. 64000
  33. 37000
  34. 20
  35. 35000
  36. 24000
  37. 15000
  38. 80
  39. 18000
  40. 1500

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