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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 824 · 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. 1.31² =
  2. 2.31² =
  3. 3.19² =
  4. 4.49² =
  5. 5.49² =
  6. 6.41² =
  7. 7.39² =
  8. 8.29² =
  9. 9.59² =
  10. 10.19² =
  11. 11.21² =
  12. 12.41² =
  13. 13.19² =
  14. 14.91² =
  15. 15.41² =
  16. 16.89² =
  17. 17.49² =
  18. 18.51² =
  19. 19.31² =
  20. 20.59² =
  21. 21.89² =
  22. 22.79² =
  23. 23.81² =
  24. 24.91² =
  25. 25.61² =
  26. 26.29² =
  27. 27.89² =
  28. 28.41² =
  29. 29.59² =
  30. 30.59² =
  31. 31.69² =
  32. 32.19² =
  33. 33.31² =
  34. 34.49² =
  35. 35.79² =
  36. 36.19² =
  37. 37.39² =
  38. 38.41² =
  39. 39.51² =
  40. 40.81² =

Answer key

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

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