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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 462 · 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 10.19 to one decimal place. =
  2. 2.Round 60731 to the nearest thousand.
  3. 3.Which is closest to 201 × 19? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  4. 4.Which is closest to 404 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  5. 5.Which is closest to 401 + 299 + 597? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  6. 6.Which is closest to 498 + 95 + 96? (a) 600 (b) 900 (c) 700 (d) 800
  7. 7.Which is closest to 598 × 88? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  8. 8.Round 31898 to the nearest hundred.
  9. 9.Round 60.88 to one decimal place. =
  10. 10.Which is closest to 1207 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  11. 11.Which is closest to 2493 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  12. 12.Round 79.08 to one decimal place. =
  13. 13.Which is closest to 299 × 22? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  14. 14.Which is closest to 498 + 397 + 700? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  15. 15.Round 17.36 to one decimal place. =
  16. 16.Which is closest to 501 × 52? (Round each number first.) (a) 2500 (b) 250000 (c) 25000 (d) 50000
  17. 17.Which is closest to 1194 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  18. 18.Which is closest to 703 × 88? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  19. 19.Which is closest to 1198 ÷ 29? (a) 400 (b) 80 (c) 40 (d) 20
  20. 20.Round 67301 to the nearest thousand.
  21. 21.Which is closest to 298 × 51? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  22. 22.Which is closest to 900 + 200 + 102? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  23. 23.Which is closest to 804 × 21? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  24. 24.Which is closest to 801 × 71? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  25. 25.Which is closest to 800 × 48? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  26. 26.Which is closest to 704 × 20? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  27. 27.Which is closest to 808 ÷ 39? (a) 20 (b) 10 (c) 200 (d) 40
  28. 28.Which is closest to 3608 ÷ 39? (a) 900 (b) 90 (c) 180 (d) 45
  29. 29.Round 43167 to the nearest hundred.
  30. 30.Round 42.07 to one decimal place. =
  31. 31.Which is closest to 696 + 498 + 104? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  32. 32.Round 90.11 to one decimal place. =
  33. 33.Round 37234 to the nearest hundred.
  34. 34.Round 55001 to the nearest hundred.
  35. 35.Round 90.34 to one decimal place. =
  36. 36.Round 80.23 to one decimal place. =
  37. 37.Round 24711 to the nearest ten.
  38. 38.Which is closest to 1600 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  39. 39.Which is closest to 98 + 201 + 202? (a) 700 (b) 400 (c) 500 (d) 600
  40. 40.Round 40121 to the nearest ten.

Answer key

  1. 10.2
  2. 61000
  3. 4000
  4. 12000
  5. 1300
  6. 700
  7. 54000
  8. 31900
  9. 60.9
  10. 40
  11. 50
  12. 79.1
  13. 6000
  14. 1600
  15. 17.4
  16. 25000
  17. 60
  18. 63000
  19. 40
  20. 67000
  21. 15000
  22. 1200
  23. 16000
  24. 56000
  25. 40000
  26. 14000
  27. 20
  28. 90
  29. 43200
  30. 42.1
  31. 1300
  32. 90.1
  33. 37200
  34. 55000
  35. 90.3
  36. 80.2
  37. 24710
  38. 80
  39. 500
  40. 40120

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