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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 569 · 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 305 + 203 + 201? (a) 600 (b) 900 (c) 700 (d) 800
  2. 2.Which is closest to 499 × 42? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  3. 3.Which is closest to 202 × 89? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  4. 4.Which is closest to 596 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  5. 5.Which is closest to 793 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  6. 6.Round 15.07 to one decimal place. =
  7. 7.Which is closest to 505 + 200 + 700? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  8. 8.Round 41487 to the nearest thousand.
  9. 9.Round 29.94 to one decimal place. =
  10. 10.Round 89595 to the nearest hundred.
  11. 11.Which is closest to 303 × 49? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  12. 12.Which is closest to 303 × 20? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  13. 13.Which is closest to 304 + 297 + 904? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  14. 14.Which is closest to 196 × 51? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  15. 15.Round 3382 to the nearest hundred.
  16. 16.Round 70823 to the nearest hundred.
  17. 17.Which is closest to 1206 ÷ 29? (a) 40 (b) 80 (c) 20 (d) 400
  18. 18.Which is closest to 1609 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  19. 19.Round 66.57 to one decimal place. =
  20. 20.Round 99879 to the nearest hundred.
  21. 21.Which is closest to 298 × 22? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  22. 22.Round 73913 to the nearest thousand.
  23. 23.Which is closest to 497 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  24. 24.Which is closest to 2497 ÷ 51? (a) 50 (b) 500 (c) 100 (d) 25
  25. 25.Round 96.86 to one decimal place. =
  26. 26.Which is closest to 605 + 197 + 305? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  27. 27.Which is closest to 96 + 600 + 400? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  28. 28.Round 51307 to the nearest ten.
  29. 29.Which is closest to 994 ÷ 49? (a) 20 (b) 40 (c) 200 (d) 10
  30. 30.Which is closest to 397 × 29? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  31. 31.Which is closest to 401 + 199 + 202? (a) 1000 (b) 700 (c) 800 (d) 900
  32. 32.Which is closest to 697 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  33. 33.Round 23.28 to one decimal place. =
  34. 34.Which is closest to 795 + 604 + 198? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  35. 35.Which is closest to 297 + 596 + 200? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  36. 36.Which is closest to 797 + 402 + 700? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  37. 37.Round 12.32 to one decimal place. =
  38. 38.Round 13.32 to one decimal place. =
  39. 39.Round 16197 to the nearest ten.
  40. 40.Which is closest to 802 × 90? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000

Answer key

  1. 700
  2. 20000
  3. 18000
  4. 20
  5. 40
  6. 15.1
  7. 1400
  8. 41000
  9. 29.9
  10. 89600
  11. 15000
  12. 6000
  13. 1500
  14. 10000
  15. 3400
  16. 70800
  17. 40
  18. 80
  19. 66.6
  20. 99900
  21. 6000
  22. 74000
  23. 25000
  24. 50
  25. 96.9
  26. 1100
  27. 1100
  28. 51310
  29. 20
  30. 12000
  31. 800
  32. 21000
  33. 23.3
  34. 1600
  35. 1100
  36. 1900
  37. 12.3
  38. 13.3
  39. 16200
  40. 72000

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