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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 530 · 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. 3.29² =
  4. 4.49² =
  5. 5.81² =
  6. 6.89² =
  7. 7.39² =
  8. 8.29² =
  9. 9.39² =
  10. 10.19² =
  11. 11.41² =
  12. 12.49² =
  13. 13.69² =
  14. 14.61² =
  15. 15.61² =
  16. 16.71² =
  17. 17.21² =
  18. 18.51² =
  19. 19.29² =
  20. 20.29² =
  21. 21.81² =
  22. 22.41² =
  23. 23.61² =
  24. 24.69² =
  25. 25.59² =
  26. 26.21² =
  27. 27.51² =
  28. 28.19² =
  29. 29.69² =
  30. 30.41² =
  31. 31.21² =
  32. 32.71² =
  33. 33.81² =
  34. 34.21² =
  35. 35.69² =
  36. 36.21² =
  37. 37.31² =
  38. 38.29² =
  39. 39.51² =
  40. 40.61² =

Answer key

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

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