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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 723 · 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. 1.29² =
  2. 2.19² =
  3. 3.31² =
  4. 4.81² =
  5. 5.81² =
  6. 6.39² =
  7. 7.31² =
  8. 8.51² =
  9. 9.31² =
  10. 10.89² =
  11. 11.39² =
  12. 12.41² =
  13. 13.41² =
  14. 14.19² =
  15. 15.41² =
  16. 16.79² =
  17. 17.29² =
  18. 18.51² =
  19. 19.79² =
  20. 20.51² =
  21. 21.39² =
  22. 22.39² =
  23. 23.31² =
  24. 24.79² =
  25. 25.59² =
  26. 26.59² =
  27. 27.59² =
  28. 28.31² =
  29. 29.81² =
  30. 30.91² =
  31. 31.29² =
  32. 32.39² =
  33. 33.61² =
  34. 34.49² =
  35. 35.19² =
  36. 36.81² =
  37. 37.79² =
  38. 38.29² =
  39. 39.61² =
  40. 40.89² =

Answer key

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

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