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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 874 · 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 24772 to the nearest ten.
  2. 2.Round 45254 to the nearest thousand.
  3. 3.Round 96.33 to one decimal place. =
  4. 4.Which is closest to 3205 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  5. 5.Which is closest to 896 + 99 + 301? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  6. 6.Which is closest to 1207 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60
  7. 7.Round 71681 to the nearest hundred.
  8. 8.Which is closest to 596 + 796 + 495? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  9. 9.Which is closest to 204 × 30? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  10. 10.Which is closest to 499 × 80? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  11. 11.Round 93.19 to one decimal place. =
  12. 12.Which is closest to 100 + 898 + 203? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  13. 13.Round 59644 to the nearest ten.
  14. 14.Which is closest to 799 + 100 + 102? (a) 1200 (b) 1100 (c) 1000 (d) 900
  15. 15.Round 91.59 to one decimal place. =
  16. 16.Which is closest to 2400 ÷ 29? (a) 80 (b) 160 (c) 800 (d) 40
  17. 17.Which is closest to 304 × 70? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  18. 18.Which is closest to 398 + 799 + 305? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  19. 19.Which is closest to 991 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  20. 20.Which is closest to 1502 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  21. 21.Which is closest to 403 + 702 + 904? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  22. 22.Which is closest to 803 × 20? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  23. 23.Which is closest to 1199 ÷ 31? (a) 20 (b) 80 (c) 400 (d) 40
  24. 24.Which is closest to 98 + 505 + 897? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  25. 25.Round 92.81 to one decimal place. =
  26. 26.Which is closest to 701 × 68? (Round each number first.) (a) 4900 (b) 490000 (c) 98000 (d) 49000
  27. 27.Round 26505 to the nearest thousand.
  28. 28.Which is closest to 399 × 62? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  29. 29.Round 36.17 to one decimal place. =
  30. 30.Which is closest to 596 × 38? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  31. 31.Which is closest to 600 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  32. 32.Which is closest to 202 × 52? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  33. 33.Which is closest to 199 + 503 + 203? (a) 1100 (b) 900 (c) 1000 (d) 800
  34. 34.Which is closest to 1791 ÷ 19? (a) 45 (b) 180 (c) 900 (d) 90
  35. 35.Round 56.22 to one decimal place. =
  36. 36.Which is closest to 896 + 301 + 298? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  37. 37.Which is closest to 900 × 78? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  38. 38.Which is closest to 700 × 81? (Round each number first.) (a) 56000 (b) 560000 (c) 5600 (d) 112000
  39. 39.Which is closest to 500 × 48? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  40. 40.Round 92.57 to one decimal place. =

Answer key

  1. 24770
  2. 45000
  3. 96.3
  4. 80
  5. 1300
  6. 60
  7. 71700
  8. 1900
  9. 6000
  10. 40000
  11. 93.2
  12. 1200
  13. 59640
  14. 1000
  15. 91.6
  16. 80
  17. 21000
  18. 1500
  19. 50
  20. 30
  21. 2000
  22. 16000
  23. 40
  24. 1500
  25. 92.8
  26. 49000
  27. 27000
  28. 24000
  29. 36.2
  30. 24000
  31. 18000
  32. 10000
  33. 900
  34. 90
  35. 56.2
  36. 1500
  37. 72000
  38. 56000
  39. 25000
  40. 92.6

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