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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 394 · 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 54890 to the nearest thousand.
  2. 2.Which is closest to 201 × 92? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  3. 3.Which is closest to 1605 ÷ 41? (a) 20 (b) 80 (c) 40 (d) 400
  4. 4.Which is closest to 800 ÷ 41? (a) 10 (b) 20 (c) 40 (d) 200
  5. 5.Which is closest to 402 × 62? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  6. 6.Which is closest to 996 ÷ 19? (a) 25 (b) 50 (c) 100 (d) 500
  7. 7.Which is closest to 198 × 71? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  8. 8.Which is closest to 2093 ÷ 31? (a) 140 (b) 35 (c) 70 (d) 700
  9. 9.Round 88.47 to one decimal place. =
  10. 10.Which is closest to 1396 ÷ 19? (a) 70 (b) 35 (c) 700 (d) 140
  11. 11.Which is closest to 896 + 702 + 98? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  12. 12.Which is closest to 1391 ÷ 21? (a) 70 (b) 700 (c) 35 (d) 140
  13. 13.Which is closest to 1405 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  14. 14.Round 38.21 to one decimal place. =
  15. 15.Round 70.32 to one decimal place. =
  16. 16.Which is closest to 300 × 48? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  17. 17.Round 64.43 to one decimal place. =
  18. 18.Round 94.67 to one decimal place. =
  19. 19.Which is closest to 599 + 204 + 195? (a) 900 (b) 1000 (c) 1100 (d) 1200
  20. 20.Round 26.76 to one decimal place. =
  21. 21.Which is closest to 402 + 197 + 896? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  22. 22.Round 86392 to the nearest hundred.
  23. 23.Which is closest to 399 + 398 + 295? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  24. 24.Round 68.44 to one decimal place. =
  25. 25.Which is closest to 2699 ÷ 31? (a) 180 (b) 90 (c) 900 (d) 45
  26. 26.Round 64720 to the nearest thousand.
  27. 27.Which is closest to 300 × 31? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  28. 28.Which is closest to 697 + 503 + 597? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  29. 29.Round 95493 to the nearest ten.
  30. 30.Which is closest to 1397 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  31. 31.Round 99.87 to one decimal place. =
  32. 32.Round 46.73 to one decimal place. =
  33. 33.Which is closest to 303 × 59? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  34. 34.Which is closest to 401 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  35. 35.Which is closest to 895 + 795 + 897? (a) 2500 (b) 2800 (c) 2600 (d) 2700
  36. 36.Which is closest to 2003 ÷ 49? (a) 20 (b) 400 (c) 40 (d) 80
  37. 37.Which is closest to 1991 ÷ 49? (a) 40 (b) 20 (c) 400 (d) 80
  38. 38.Which is closest to 298 + 505 + 299? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  39. 39.Round 25.09 to one decimal place. =
  40. 40.Which is closest to 696 × 28? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000

Answer key

  1. 55000
  2. 18000
  3. 40
  4. 20
  5. 24000
  6. 50
  7. 14000
  8. 70
  9. 88.5
  10. 70
  11. 1700
  12. 70
  13. 70
  14. 38.2
  15. 70.3
  16. 15000
  17. 64.4
  18. 94.7
  19. 1000
  20. 26.8
  21. 1500
  22. 86400
  23. 1100
  24. 68.4
  25. 90
  26. 65000
  27. 9000
  28. 1800
  29. 95490
  30. 70
  31. 99.9
  32. 46.7
  33. 18000
  34. 20
  35. 2600
  36. 40
  37. 40
  38. 1100
  39. 25.1
  40. 21000

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