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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 311 · 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 791 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
  2. 2.Round 1378 to the nearest hundred.
  3. 3.Round 88.19 to one decimal place. =
  4. 4.Round 22886 to the nearest hundred.
  5. 5.Which is closest to 96 + 201 + 899? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  6. 6.Which is closest to 1201 ÷ 41? (a) 300 (b) 15 (c) 60 (d) 30
  7. 7.Which is closest to 1994 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  8. 8.Round 64089 to the nearest thousand.
  9. 9.Which is closest to 1200 ÷ 21? (a) 60 (b) 30 (c) 120 (d) 600
  10. 10.Round 20431 to the nearest thousand.
  11. 11.Round 83.58 to one decimal place. =
  12. 12.Round 12544 to the nearest ten.
  13. 13.Round 23.64 to one decimal place. =
  14. 14.Round 32.86 to one decimal place. =
  15. 15.Round 86993 to the nearest hundred.
  16. 16.Which is closest to 1792 ÷ 19? (a) 180 (b) 90 (c) 900 (d) 45
  17. 17.Round 92942 to the nearest thousand.
  18. 18.Round 36.88 to one decimal place. =
  19. 19.Which is closest to 202 × 49? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  20. 20.Which is closest to 1609 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  21. 21.Which is closest to 696 + 197 + 805? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  22. 22.Round 41162 to the nearest ten.
  23. 23.Which is closest to 498 + 197 + 95? (a) 700 (b) 800 (c) 1000 (d) 900
  24. 24.Round 41160 to the nearest thousand.
  25. 25.Round 73.54 to one decimal place. =
  26. 26.Which is closest to 797 × 70? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  27. 27.Which is closest to 799 × 29? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  28. 28.Which is closest to 899 × 80? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  29. 29.Which is closest to 701 + 695 + 805? (a) 2200 (b) 2100 (c) 2400 (d) 2300
  30. 30.Which is closest to 498 × 80? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  31. 31.Which is closest to 1001 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  32. 32.Which is closest to 897 × 92? (Round each number first.) (a) 81000 (b) 810000 (c) 162000 (d) 8100
  33. 33.Round 85452 to the nearest thousand.
  34. 34.Round 50.48 to one decimal place. =
  35. 35.Which is closest to 198 × 20? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  36. 36.Which is closest to 299 × 72? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  37. 37.Which is closest to 498 × 19? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  38. 38.Which is closest to 797 × 28? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  39. 39.Which is closest to 103 + 298 + 102? (a) 400 (b) 500 (c) 700 (d) 600
  40. 40.Round 12.79 to one decimal place. =

Answer key

  1. 40
  2. 1400
  3. 88.2
  4. 22900
  5. 1200
  6. 30
  7. 50
  8. 64000
  9. 60
  10. 20000
  11. 83.6
  12. 12540
  13. 23.6
  14. 32.9
  15. 87000
  16. 90
  17. 93000
  18. 36.9
  19. 10000
  20. 80
  21. 1700
  22. 41160
  23. 800
  24. 41000
  25. 73.5
  26. 56000
  27. 24000
  28. 72000
  29. 2200
  30. 40000
  31. 20
  32. 81000
  33. 85000
  34. 50.5
  35. 4000
  36. 21000
  37. 10000
  38. 24000
  39. 500
  40. 12.8

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