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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 757 · 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 299 + 298 + 300? (a) 1000 (b) 800 (c) 1100 (d) 900
  2. 2.Which is closest to 601 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  3. 3.Round 38369 to the nearest thousand.
  4. 4.Which is closest to 603 ÷ 19? (a) 300 (b) 15 (c) 30 (d) 60
  5. 5.Round 16.34 to one decimal place. =
  6. 6.Round 89.07 to one decimal place. =
  7. 7.Which is closest to 601 × 59? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  8. 8.Which is closest to 2400 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  9. 9.Round 41913 to the nearest hundred.
  10. 10.Which is closest to 598 + 700 + 596? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  11. 11.Which is closest to 798 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  12. 12.Which is closest to 1202 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  13. 13.Round 29.11 to one decimal place. =
  14. 14.Which is closest to 196 × 39? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  15. 15.Which is closest to 1802 ÷ 29? (a) 60 (b) 30 (c) 120 (d) 600
  16. 16.Round 60.88 to one decimal place. =
  17. 17.Round 17.49 to one decimal place. =
  18. 18.Which is closest to 402 × 92? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  19. 19.Which is closest to 295 + 599 + 304? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  20. 20.Which is closest to 2799 ÷ 39? (a) 35 (b) 70 (c) 700 (d) 140
  21. 21.Which is closest to 200 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  22. 22.Which is closest to 903 × 18? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  23. 23.Round 43437 to the nearest hundred.
  24. 24.Which is closest to 598 + 895 + 297? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  25. 25.Which is closest to 696 + 701 + 899? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  26. 26.Round 20.44 to one decimal place. =
  27. 27.Which is closest to 198 × 71? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  28. 28.Round 67603 to the nearest ten.
  29. 29.Which is closest to 98 + 702 + 202? (a) 1100 (b) 900 (c) 1000 (d) 1200
  30. 30.Round 21.41 to one decimal place. =
  31. 31.Which is closest to 1793 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  32. 32.Round 36119 to the nearest ten.
  33. 33.Which is closest to 791 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  34. 34.Round 29.59 to one decimal place. =
  35. 35.Which is closest to 798 + 395 + 100? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  36. 36.Which is closest to 2502 ÷ 49? (a) 500 (b) 100 (c) 50 (d) 25
  37. 37.Round 17.06 to one decimal place. =
  38. 38.Which is closest to 797 + 201 + 504? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  39. 39.Which is closest to 401 × 18? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  40. 40.Which is closest to 4492 ÷ 51? (a) 45 (b) 180 (c) 900 (d) 90

Answer key

  1. 900
  2. 18000
  3. 38000
  4. 30
  5. 16.3
  6. 89.1
  7. 36000
  8. 80
  9. 41900
  10. 1900
  11. 40
  12. 30
  13. 29.1
  14. 8000
  15. 60
  16. 60.9
  17. 17.5
  18. 36000
  19. 1200
  20. 70
  21. 8000
  22. 18000
  23. 43400
  24. 1800
  25. 2300
  26. 20.4
  27. 14000
  28. 67600
  29. 1000
  30. 21.4
  31. 60
  32. 36120
  33. 40
  34. 29.6
  35. 1300
  36. 50
  37. 17.1
  38. 1500
  39. 8000
  40. 90

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