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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 170 · 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 200 × 42? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  2. 2.Round 24.31 to one decimal place. =
  3. 3.Which is closest to 804 + 202 + 396? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  4. 4.Round 15343 to the nearest ten.
  5. 5.Round 73957 to the nearest ten.
  6. 6.Which is closest to 304 × 71? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  7. 7.Which is closest to 97 + 302 + 502? (a) 1100 (b) 800 (c) 1000 (d) 900
  8. 8.Which is closest to 300 + 202 + 502? (a) 1100 (b) 900 (c) 1000 (d) 1200
  9. 9.Which is closest to 1504 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  10. 10.Round 37.06 to one decimal place. =
  11. 11.Round 23410 to the nearest thousand.
  12. 12.Round 93638 to the nearest hundred.
  13. 13.Round 46.16 to one decimal place. =
  14. 14.Which is closest to 205 + 197 + 702? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  15. 15.Round 17891 to the nearest thousand.
  16. 16.Round 44.14 to one decimal place. =
  17. 17.Which is closest to 198 × 19? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  18. 18.Round 99.53 to one decimal place. =
  19. 19.Round 86097 to the nearest hundred.
  20. 20.Round 75289 to the nearest ten.
  21. 21.Which is closest to 2096 ÷ 29? (a) 70 (b) 35 (c) 140 (d) 700
  22. 22.Round 54.24 to one decimal place. =
  23. 23.Which is closest to 1596 ÷ 41? (a) 20 (b) 400 (c) 40 (d) 80
  24. 24.Which is closest to 699 × 79? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  25. 25.Round 13538 to the nearest thousand.
  26. 26.Which is closest to 600 × 71? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  27. 27.Which is closest to 500 × 51? (Round each number first.) (a) 2500 (b) 50000 (c) 25000 (d) 250000
  28. 28.Which is closest to 1791 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  29. 29.Which is closest to 394 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  30. 30.Which is closest to 4503 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  31. 31.Which is closest to 3006 ÷ 51? (a) 30 (b) 60 (c) 600 (d) 120
  32. 32.Which is closest to 598 ÷ 19? (a) 60 (b) 300 (c) 30 (d) 15
  33. 33.Which is closest to 396 × 92? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  34. 34.Which is closest to 394 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  35. 35.Which is closest to 801 × 72? (Round each number first.) (a) 112000 (b) 56000 (c) 5600 (d) 560000
  36. 36.Which is closest to 703 + 199 + 601? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  37. 37.Which is closest to 798 × 30? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  38. 38.Which is closest to 992 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  39. 39.Round 78.49 to one decimal place. =
  40. 40.Round 41.92 to one decimal place. =

Answer key

  1. 8000
  2. 24.3
  3. 1400
  4. 15340
  5. 73960
  6. 21000
  7. 900
  8. 1000
  9. 30
  10. 37.1
  11. 23000
  12. 93600
  13. 46.2
  14. 1100
  15. 18000
  16. 44.1
  17. 4000
  18. 99.5
  19. 86100
  20. 75290
  21. 70
  22. 54.2
  23. 40
  24. 56000
  25. 14000
  26. 42000
  27. 25000
  28. 90
  29. 20
  30. 90
  31. 60
  32. 30
  33. 36000
  34. 20
  35. 56000
  36. 1500
  37. 24000
  38. 20
  39. 78.5
  40. 41.9

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