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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 499 · 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 2806 ÷ 39? (a) 70 (b) 35 (c) 700 (d) 140
  2. 2.Round 54.39 to one decimal place. =
  3. 3.Which is closest to 703 × 38? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  4. 4.Round 31621 to the nearest ten.
  5. 5.Which is closest to 1401 ÷ 21? (a) 35 (b) 70 (c) 140 (d) 700
  6. 6.Which is closest to 1194 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
  7. 7.Round 77333 to the nearest hundred.
  8. 8.Round 60.08 to one decimal place. =
  9. 9.Which is closest to 599 + 100 + 96? (a) 1000 (b) 900 (c) 800 (d) 700
  10. 10.Which is closest to 1397 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  11. 11.Which is closest to 301 × 52? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  12. 12.Which is closest to 801 × 50? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  13. 13.Round 74458 to the nearest thousand.
  14. 14.Which is closest to 395 + 897 + 105? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  15. 15.Round 98791 to the nearest ten.
  16. 16.Which is closest to 800 + 504 + 296? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  17. 17.Which is closest to 396 × 22? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  18. 18.Which is closest to 901 × 81? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  19. 19.Which is closest to 804 × 90? (Round each number first.) (a) 144000 (b) 7200 (c) 72000 (d) 720000
  20. 20.Round 35284 to the nearest ten.
  21. 21.Which is closest to 901 × 80? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  22. 22.Which is closest to 1504 ÷ 49? (a) 300 (b) 15 (c) 30 (d) 60
  23. 23.Which is closest to 795 + 505 + 600? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  24. 24.Which is closest to 402 ÷ 19? (a) 40 (b) 10 (c) 20 (d) 200
  25. 25.Round 47.52 to one decimal place. =
  26. 26.Which is closest to 4507 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  27. 27.Which is closest to 196 × 70? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  28. 28.Which is closest to 3504 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  29. 29.Which is closest to 2804 ÷ 39? (a) 70 (b) 140 (c) 35 (d) 700
  30. 30.Which is closest to 300 × 78? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  31. 31.Round 23452 to the nearest ten.
  32. 32.Which is closest to 791 ÷ 21? (a) 400 (b) 20 (c) 40 (d) 80
  33. 33.Which is closest to 802 × 19? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  34. 34.Which is closest to 95 + 903 + 899? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  35. 35.Which is closest to 296 × 91? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  36. 36.Which is closest to 196 × 71? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  37. 37.Which is closest to 796 ÷ 19? (a) 80 (b) 400 (c) 20 (d) 40
  38. 38.Which is closest to 400 + 398 + 399? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  39. 39.Round 31208 to the nearest ten.
  40. 40.Which is closest to 903 + 504 + 295? (a) 1900 (b) 1700 (c) 1800 (d) 1600

Answer key

  1. 70
  2. 54.4
  3. 28000
  4. 31620
  5. 70
  6. 40
  7. 77300
  8. 60.1
  9. 800
  10. 70
  11. 15000
  12. 40000
  13. 74000
  14. 1400
  15. 98790
  16. 1600
  17. 8000
  18. 72000
  19. 72000
  20. 35280
  21. 72000
  22. 30
  23. 1900
  24. 20
  25. 47.5
  26. 90
  27. 14000
  28. 70
  29. 70
  30. 24000
  31. 23450
  32. 40
  33. 16000
  34. 1900
  35. 27000
  36. 14000
  37. 40
  38. 1200
  39. 31210
  40. 1700

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