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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 178 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.21² =
  2. 2.31² =
  3. 3.49² =
  4. 4.31² =
  5. 5.21² =
  6. 6.41² =
  7. 7.71² =
  8. 8.51² =
  9. 9.31² =
  10. 10.71² =
  11. 11.31² =
  12. 12.71² =
  13. 13.51² =
  14. 14.19² =
  15. 15.41² =
  16. 16.41² =
  17. 17.49² =
  18. 18.79² =
  19. 19.81² =
  20. 20.79² =
  21. 21.91² =
  22. 22.69² =
  23. 23.61² =
  24. 24.49² =
  25. 25.79² =
  26. 26.59² =
  27. 27.41² =
  28. 28.51² =
  29. 29.41² =
  30. 30.21² =
  31. 31.59² =
  32. 32.41² =
  33. 33.31² =
  34. 34.49² =
  35. 35.69² =
  36. 36.51² =
  37. 37.49² =
  38. 38.79² =
  39. 39.49² =
  40. 40.91² =

Answer key

  1. 441
  2. 961
  3. 2401
  4. 961
  5. 441
  6. 1681
  7. 5041
  8. 2601
  9. 961
  10. 5041
  11. 961
  12. 5041
  13. 2601
  14. 361
  15. 1681
  16. 1681
  17. 2401
  18. 6241
  19. 6561
  20. 6241
  21. 8281
  22. 4761
  23. 3721
  24. 2401
  25. 6241
  26. 3481
  27. 1681
  28. 2601
  29. 1681
  30. 441
  31. 3481
  32. 1681
  33. 961
  34. 2401
  35. 4761
  36. 2601
  37. 2401
  38. 6241
  39. 2401
  40. 8281

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