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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 235 · 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 62233 to the nearest thousand.
  2. 2.Which is closest to 98 + 204 + 804? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  3. 3.Which is closest to 408 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  4. 4.Round 14076 to the nearest hundred.
  5. 5.Which is closest to 1398 ÷ 21? (a) 35 (b) 70 (c) 700 (d) 140
  6. 6.Which is closest to 1804 ÷ 31? (a) 60 (b) 120 (c) 600 (d) 30
  7. 7.Which is closest to 793 ÷ 21? (a) 40 (b) 80 (c) 400 (d) 20
  8. 8.Round 63.18 to one decimal place. =
  9. 9.Which is closest to 699 + 705 + 96? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  10. 10.Round 17244 to the nearest thousand.
  11. 11.Which is closest to 500 × 62? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  12. 12.Which is closest to 95 + 198 + 503? (a) 700 (b) 1000 (c) 900 (d) 800
  13. 13.Which is closest to 102 + 897 + 601? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  14. 14.Which is closest to 201 × 91? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  15. 15.Which is closest to 804 × 78? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  16. 16.Round 35428 to the nearest ten.
  17. 17.Which is closest to 195 + 900 + 903? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  18. 18.Round 50207 to the nearest thousand.
  19. 19.Which is closest to 3608 ÷ 41? (a) 90 (b) 45 (c) 180 (d) 900
  20. 20.Which is closest to 404 × 21? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  21. 21.Which is closest to 101 + 303 + 397? (a) 900 (b) 700 (c) 1000 (d) 800
  22. 22.Round 60.62 to one decimal place. =
  23. 23.Which is closest to 802 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  24. 24.Round 63.61 to one decimal place. =
  25. 25.Which is closest to 298 × 42? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  26. 26.Which is closest to 503 + 701 + 595? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  27. 27.Round 19.61 to one decimal place. =
  28. 28.Which is closest to 1002 ÷ 51? (a) 40 (b) 20 (c) 200 (d) 10
  29. 29.Round 61.19 to one decimal place. =
  30. 30.Which is closest to 2393 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  31. 31.Round 86.86 to one decimal place. =
  32. 32.Which is closest to 804 × 80? (Round each number first.) (a) 6400 (b) 640000 (c) 64000 (d) 128000
  33. 33.Which is closest to 3491 ÷ 49? (a) 70 (b) 700 (c) 35 (d) 140
  34. 34.Round 29.36 to one decimal place. =
  35. 35.Round 27.94 to one decimal place. =
  36. 36.Which is closest to 396 + 396 + 397? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  37. 37.Which is closest to 303 × 68? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  38. 38.Round 13.58 to one decimal place. =
  39. 39.Which is closest to 796 × 22? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  40. 40.Round 54.47 to one decimal place. =

Answer key

  1. 62000
  2. 1100
  3. 20
  4. 14100
  5. 70
  6. 60
  7. 40
  8. 63.2
  9. 1500
  10. 17000
  11. 30000
  12. 800
  13. 1600
  14. 18000
  15. 64000
  16. 35430
  17. 2000
  18. 50000
  19. 90
  20. 8000
  21. 800
  22. 60.6
  23. 20
  24. 63.6
  25. 12000
  26. 1800
  27. 19.6
  28. 20
  29. 61.2
  30. 80
  31. 86.9
  32. 64000
  33. 70
  34. 29.4
  35. 27.9
  36. 1200
  37. 21000
  38. 13.6
  39. 16000
  40. 54.5

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