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Squares Near 50 Worksheet

Speed calculation lesson 25: Squares near 50 · Set 9 · 40 questions
TalentJR

The fast method (From 25 and the gap): Find the gap from 50: 53 is 50 + 3, 46 is 50 − 4. First part: 25 + gap above 50, or 25 − gap below 50. Last two digits: the gap squared, written as 2 digits — 3² = 09. Join them: 53² = 28|09 = 2809.

NameDateTime takenScore ___ / 40
  1. 1.56² =
  2. 2.51² =
  3. 3.41² =
  4. 4.59² =
  5. 5.52² =
  6. 6.51² =
  7. 7.51² =
  8. 8.47² =
  9. 9.59² =
  10. 10.47² =
  11. 11.59² =
  12. 12.48² =
  13. 13.41² =
  14. 14.56² =
  15. 15.53² =
  16. 16.51² =
  17. 17.51² =
  18. 18.58² =
  19. 19.59² =
  20. 20.53² =
  21. 21.42² =
  22. 22.47² =
  23. 23.59² =
  24. 24.54² =
  25. 25.48² =
  26. 26.54² =
  27. 27.45² =
  28. 28.59² =
  29. 29.59² =
  30. 30.56² =
  31. 31.49² =
  32. 32.56² =
  33. 33.51² =
  34. 34.47² =
  35. 35.59² =
  36. 36.47² =
  37. 37.58² =
  38. 38.44² =
  39. 39.47² =
  40. 40.48² =

Answer key

  1. 3136
  2. 2601
  3. 1681
  4. 3481
  5. 2704
  6. 2601
  7. 2601
  8. 2209
  9. 3481
  10. 2209
  11. 3481
  12. 2304
  13. 1681
  14. 3136
  15. 2809
  16. 2601
  17. 2601
  18. 3364
  19. 3481
  20. 2809
  21. 1764
  22. 2209
  23. 3481
  24. 2916
  25. 2304
  26. 2916
  27. 2025
  28. 3481
  29. 3481
  30. 3136
  31. 2401
  32. 3136
  33. 2601
  34. 2209
  35. 3481
  36. 2209
  37. 3364
  38. 1936
  39. 2209
  40. 2304

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