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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 733 · 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 66712 to the nearest hundred.
  2. 2.Round 49940 to the nearest hundred.
  3. 3.Which is closest to 398 × 48? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  4. 4.Round 68.37 to one decimal place. =
  5. 5.Round 28737 to the nearest ten.
  6. 6.Which is closest to 196 + 603 + 701? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  7. 7.Round 68644 to the nearest ten.
  8. 8.Round 25102 to the nearest hundred.
  9. 9.Which is closest to 1603 ÷ 39? (a) 20 (b) 80 (c) 40 (d) 400
  10. 10.Which is closest to 204 × 80? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  11. 11.Round 75426 to the nearest ten.
  12. 12.Which is closest to 196 + 404 + 103? (a) 600 (b) 800 (c) 700 (d) 900
  13. 13.Round 63528 to the nearest ten.
  14. 14.Which is closest to 203 × 68? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  15. 15.Round 36.22 to one decimal place. =
  16. 16.Round 99.26 to one decimal place. =
  17. 17.Which is closest to 595 + 296 + 197? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  18. 18.Round 70.74 to one decimal place. =
  19. 19.Which is closest to 1205 ÷ 19? (a) 60 (b) 600 (c) 120 (d) 30
  20. 20.Which is closest to 809 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
  21. 21.Round 26198 to the nearest ten.
  22. 22.Which is closest to 607 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  23. 23.Round 65118 to the nearest thousand.
  24. 24.Round 11704 to the nearest ten.
  25. 25.Which is closest to 798 × 48? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  26. 26.Which is closest to 2399 ÷ 31? (a) 40 (b) 80 (c) 160 (d) 800
  27. 27.Round 35.11 to one decimal place. =
  28. 28.Which is closest to 1191 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  29. 29.Which is closest to 803 × 80? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
  30. 30.Round 91.32 to one decimal place. =
  31. 31.Which is closest to 397 + 697 + 104? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  32. 32.Round 28709 to the nearest ten.
  33. 33.Which is closest to 502 × 50? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  34. 34.Round 12.31 to one decimal place. =
  35. 35.Which is closest to 1603 ÷ 41? (a) 400 (b) 80 (c) 40 (d) 20
  36. 36.Which is closest to 300 × 52? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  37. 37.Round 93.59 to one decimal place. =
  38. 38.Which is closest to 1392 ÷ 21? (a) 70 (b) 700 (c) 35 (d) 140
  39. 39.Which is closest to 803 × 18? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  40. 40.Round 57364 to the nearest ten.

Answer key

  1. 66700
  2. 49900
  3. 20000
  4. 68.4
  5. 28740
  6. 1500
  7. 68640
  8. 25100
  9. 40
  10. 16000
  11. 75430
  12. 700
  13. 63530
  14. 14000
  15. 36.2
  16. 99.3
  17. 1100
  18. 70.7
  19. 60
  20. 40
  21. 26200
  22. 30
  23. 65000
  24. 11700
  25. 40000
  26. 80
  27. 35.1
  28. 40
  29. 64000
  30. 91.3
  31. 1200
  32. 28710
  33. 25000
  34. 12.3
  35. 40
  36. 15000
  37. 93.6
  38. 70
  39. 16000
  40. 57360

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