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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 91 · 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. 2.59² =
  3. 3.89² =
  4. 4.89² =
  5. 5.91² =
  6. 6.59² =
  7. 7.81² =
  8. 8.59² =
  9. 9.31² =
  10. 10.31² =
  11. 11.51² =
  12. 12.31² =
  13. 13.81² =
  14. 14.19² =
  15. 15.89² =
  16. 16.19² =
  17. 17.51² =
  18. 18.81² =
  19. 19.89² =
  20. 20.19² =
  21. 21.49² =
  22. 22.69² =
  23. 23.21² =
  24. 24.41² =
  25. 25.49² =
  26. 26.49² =
  27. 27.41² =
  28. 28.71² =
  29. 29.41² =
  30. 30.61² =
  31. 31.81² =
  32. 32.91² =
  33. 33.71² =
  34. 34.29² =
  35. 35.51² =
  36. 36.51² =
  37. 37.71² =
  38. 38.29² =
  39. 39.49² =
  40. 40.49² =

Answer key

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

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