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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 866 · 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. 1.91² =
  2. 2.31² =
  3. 3.69² =
  4. 4.39² =
  5. 5.19² =
  6. 6.41² =
  7. 7.79² =
  8. 8.29² =
  9. 9.39² =
  10. 10.59² =
  11. 11.31² =
  12. 12.19² =
  13. 13.81² =
  14. 14.19² =
  15. 15.41² =
  16. 16.49² =
  17. 17.41² =
  18. 18.71² =
  19. 19.49² =
  20. 20.31² =
  21. 21.31² =
  22. 22.89² =
  23. 23.51² =
  24. 24.39² =
  25. 25.29² =
  26. 26.21² =
  27. 27.39² =
  28. 28.91² =
  29. 29.29² =
  30. 30.91² =
  31. 31.61² =
  32. 32.89² =
  33. 33.21² =
  34. 34.39² =
  35. 35.19² =
  36. 36.49² =
  37. 37.31² =
  38. 38.79² =
  39. 39.79² =
  40. 40.19² =

Answer key

  1. 8281
  2. 961
  3. 4761
  4. 1521
  5. 361
  6. 1681
  7. 6241
  8. 841
  9. 1521
  10. 3481
  11. 961
  12. 361
  13. 6561
  14. 361
  15. 1681
  16. 2401
  17. 1681
  18. 5041
  19. 2401
  20. 961
  21. 961
  22. 7921
  23. 2601
  24. 1521
  25. 841
  26. 441
  27. 1521
  28. 8281
  29. 841
  30. 8281
  31. 3721
  32. 7921
  33. 441
  34. 1521
  35. 361
  36. 2401
  37. 961
  38. 6241
  39. 6241
  40. 361

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