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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 942 · 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 28.88 to one decimal place. =
  2. 2.Which is closest to 700 × 29? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  3. 3.Which is closest to 3991 ÷ 49? (a) 80 (b) 160 (c) 800 (d) 40
  4. 4.Which is closest to 602 × 71? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  5. 5.Round 79582 to the nearest thousand.
  6. 6.Which is closest to 596 × 52? (Round each number first.) (a) 300000 (b) 30000 (c) 3000 (d) 60000
  7. 7.Which is closest to 397 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  8. 8.Which is closest to 807 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  9. 9.Which is closest to 399 × 51? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  10. 10.Round 65793 to the nearest ten.
  11. 11.Which is closest to 804 × 22? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  12. 12.Which is closest to 1203 ÷ 19? (a) 60 (b) 600 (c) 30 (d) 120
  13. 13.Which is closest to 695 + 404 + 199? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  14. 14.Round 24.66 to one decimal place. =
  15. 15.Which is closest to 2107 ÷ 29? (a) 35 (b) 70 (c) 140 (d) 700
  16. 16.Which is closest to 4501 ÷ 49? (a) 45 (b) 900 (c) 90 (d) 180
  17. 17.Which is closest to 4008 ÷ 51? (a) 40 (b) 80 (c) 800 (d) 160
  18. 18.Round 19.63 to one decimal place. =
  19. 19.Which is closest to 901 × 92? (Round each number first.) (a) 162000 (b) 810000 (c) 8100 (d) 81000
  20. 20.Which is closest to 298 + 300 + 399? (a) 1000 (b) 1100 (c) 900 (d) 1200
  21. 21.Round 33.86 to one decimal place. =
  22. 22.Which is closest to 1194 ÷ 29? (a) 80 (b) 20 (c) 400 (d) 40
  23. 23.Which is closest to 904 × 52? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  24. 24.Which is closest to 603 × 19? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  25. 25.Which is closest to 502 + 296 + 902? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  26. 26.Which is closest to 898 × 90? (Round each number first.) (a) 810000 (b) 81000 (c) 162000 (d) 8100
  27. 27.Round 31.52 to one decimal place. =
  28. 28.Round 52587 to the nearest thousand.
  29. 29.Which is closest to 603 × 28? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  30. 30.Which is closest to 697 + 898 + 498? (a) 2100 (b) 2300 (c) 2000 (d) 2200
  31. 31.Which is closest to 1598 ÷ 39? (a) 40 (b) 400 (c) 20 (d) 80
  32. 32.Which is closest to 398 × 49? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  33. 33.Round 90.83 to one decimal place. =
  34. 34.Round 26.16 to one decimal place. =
  35. 35.Round 36185 to the nearest thousand.
  36. 36.Round 40.91 to one decimal place. =
  37. 37.Which is closest to 792 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  38. 38.Which is closest to 502 × 40? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  39. 39.Which is closest to 197 × 69? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  40. 40.Round 87691 to the nearest ten.

Answer key

  1. 28.9
  2. 21000
  3. 80
  4. 42000
  5. 80000
  6. 30000
  7. 20
  8. 20
  9. 20000
  10. 65790
  11. 16000
  12. 60
  13. 1300
  14. 24.7
  15. 70
  16. 90
  17. 80
  18. 19.6
  19. 81000
  20. 1000
  21. 33.9
  22. 40
  23. 45000
  24. 12000
  25. 1700
  26. 81000
  27. 31.5
  28. 53000
  29. 18000
  30. 2100
  31. 40
  32. 20000
  33. 90.8
  34. 26.2
  35. 36000
  36. 40.9
  37. 40
  38. 20000
  39. 14000
  40. 87690

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