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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 283 · 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 22.78 to one decimal place. =
  2. 2.Which is closest to 803 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
  3. 3.Round 61689 to the nearest thousand.
  4. 4.Round 72.61 to one decimal place. =
  5. 5.Which is closest to 407 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  6. 6.Which is closest to 994 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40
  7. 7.Which is closest to 203 + 97 + 595? (a) 1100 (b) 900 (c) 800 (d) 1000
  8. 8.Which is closest to 198 + 301 + 601? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  9. 9.Which is closest to 609 ÷ 29? (a) 200 (b) 20 (c) 10 (d) 40
  10. 10.Which is closest to 1802 ÷ 29? (a) 60 (b) 120 (c) 600 (d) 30
  11. 11.Round 94092 to the nearest thousand.
  12. 12.Which is closest to 304 × 52? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  13. 13.Which is closest to 700 × 89? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  14. 14.Which is closest to 902 + 905 + 801? (a) 2500 (b) 2700 (c) 2800 (d) 2600
  15. 15.Which is closest to 402 + 502 + 299? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  16. 16.Round 89.19 to one decimal place. =
  17. 17.Which is closest to 202 × 90? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  18. 18.Which is closest to 399 ÷ 19? (a) 200 (b) 10 (c) 40 (d) 20
  19. 19.Round 33804 to the nearest ten.
  20. 20.Which is closest to 1409 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  21. 21.Round 36.83 to one decimal place. =
  22. 22.Which is closest to 697 + 202 + 396? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  23. 23.Which is closest to 2491 ÷ 51? (a) 500 (b) 50 (c) 25 (d) 100
  24. 24.Round 96.12 to one decimal place. =
  25. 25.Round 28570 to the nearest hundred.
  26. 26.Which is closest to 800 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  27. 27.Round 20.44 to one decimal place. =
  28. 28.Which is closest to 897 + 302 + 805? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  29. 29.Which is closest to 1494 ÷ 49? (a) 15 (b) 30 (c) 300 (d) 60
  30. 30.Round 80967 to the nearest thousand.
  31. 31.Which is closest to 203 × 69? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  32. 32.Round 18.54 to one decimal place. =
  33. 33.Round 54.44 to one decimal place. =
  34. 34.Which is closest to 504 + 804 + 795? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  35. 35.Which is closest to 299 × 21? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  36. 36.Round 11973 to the nearest thousand.
  37. 37.Which is closest to 105 + 799 + 498? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  38. 38.Round 95989 to the nearest ten.
  39. 39.Round 18440 to the nearest thousand.
  40. 40.Round 76.06 to one decimal place. =

Answer key

  1. 22.8
  2. 40
  3. 62000
  4. 72.6
  5. 20
  6. 20
  7. 900
  8. 1100
  9. 20
  10. 60
  11. 94000
  12. 15000
  13. 63000
  14. 2600
  15. 1200
  16. 89.2
  17. 18000
  18. 20
  19. 33800
  20. 70
  21. 36.8
  22. 1300
  23. 50
  24. 96.1
  25. 28600
  26. 24000
  27. 20.4
  28. 2000
  29. 30
  30. 81000
  31. 14000
  32. 18.5
  33. 54.4
  34. 2100
  35. 6000
  36. 12000
  37. 1400
  38. 95990
  39. 18000
  40. 76.1

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