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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 512 · 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. 2.59² =
  3. 3.89² =
  4. 4.31² =
  5. 5.59² =
  6. 6.71² =
  7. 7.61² =
  8. 8.21² =
  9. 9.69² =
  10. 10.59² =
  11. 11.41² =
  12. 12.29² =
  13. 13.21² =
  14. 14.39² =
  15. 15.41² =
  16. 16.69² =
  17. 17.81² =
  18. 18.39² =
  19. 19.71² =
  20. 20.89² =
  21. 21.41² =
  22. 22.31² =
  23. 23.31² =
  24. 24.29² =
  25. 25.81² =
  26. 26.31² =
  27. 27.89² =
  28. 28.61² =
  29. 29.59² =
  30. 30.69² =
  31. 31.41² =
  32. 32.69² =
  33. 33.21² =
  34. 34.59² =
  35. 35.49² =
  36. 36.39² =
  37. 37.49² =
  38. 38.39² =
  39. 39.69² =
  40. 40.51² =

Answer key

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

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