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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 58 · 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 1608 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
  2. 2.Which is closest to 1604 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  3. 3.Round 68488 to the nearest thousand.
  4. 4.Which is closest to 802 × 20? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  5. 5.Which is closest to 2106 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  6. 6.Round 75.66 to one decimal place. =
  7. 7.Which is closest to 202 × 48? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000
  8. 8.Round 41644 to the nearest ten.
  9. 9.Which is closest to 403 × 41? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  10. 10.Round 64.38 to one decimal place. =
  11. 11.Which is closest to 604 ÷ 21? (a) 30 (b) 300 (c) 15 (d) 60
  12. 12.Which is closest to 297 + 496 + 895? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  13. 13.Round 31.31 to one decimal place. =
  14. 14.Which is closest to 791 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  15. 15.Round 46275 to the nearest thousand.
  16. 16.Round 98452 to the nearest thousand.
  17. 17.Which is closest to 1602 ÷ 41? (a) 40 (b) 80 (c) 20 (d) 400
  18. 18.Round 65.46 to one decimal place. =
  19. 19.Round 29.67 to one decimal place. =
  20. 20.Round 37671 to the nearest thousand.
  21. 21.Which is closest to 297 × 29? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  22. 22.Round 26.68 to one decimal place. =
  23. 23.Round 55.56 to one decimal place. =
  24. 24.Which is closest to 796 ÷ 21? (a) 40 (b) 20 (c) 400 (d) 80
  25. 25.Which is closest to 102 + 505 + 901? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  26. 26.Which is closest to 1005 ÷ 21? (a) 500 (b) 25 (c) 100 (d) 50
  27. 27.Which is closest to 396 + 197 + 695? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  28. 28.Which is closest to 896 + 304 + 98? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  29. 29.Round 40.12 to one decimal place. =
  30. 30.Round 16821 to the nearest hundred.
  31. 31.Which is closest to 203 × 38? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  32. 32.Round 88.54 to one decimal place. =
  33. 33.Which is closest to 1806 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  34. 34.Which is closest to 904 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  35. 35.Round 32.84 to one decimal place. =
  36. 36.Round 51205 to the nearest hundred.
  37. 37.Which is closest to 497 + 96 + 601? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  38. 38.Round 34554 to the nearest ten.
  39. 39.Which is closest to 696 × 79? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  40. 40.Round 46.36 to one decimal place. =

Answer key

  1. 80
  2. 80
  3. 68000
  4. 16000
  5. 70
  6. 75.7
  7. 10000
  8. 41640
  9. 16000
  10. 64.4
  11. 30
  12. 1700
  13. 31.3
  14. 20
  15. 46000
  16. 98000
  17. 40
  18. 65.5
  19. 29.7
  20. 38000
  21. 9000
  22. 26.7
  23. 55.6
  24. 40
  25. 1500
  26. 50
  27. 1300
  28. 1300
  29. 40.1
  30. 16800
  31. 8000
  32. 88.5
  33. 60
  34. 27000
  35. 32.8
  36. 51200
  37. 1200
  38. 34550
  39. 56000
  40. 46.4

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