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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 692 · 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. 1.19² =
  2. 2.49² =
  3. 3.91² =
  4. 4.51² =
  5. 5.19² =
  6. 6.41² =
  7. 7.31² =
  8. 8.51² =
  9. 9.41² =
  10. 10.31² =
  11. 11.19² =
  12. 12.49² =
  13. 13.31² =
  14. 14.89² =
  15. 15.59² =
  16. 16.69² =
  17. 17.19² =
  18. 18.61² =
  19. 19.31² =
  20. 20.59² =
  21. 21.69² =
  22. 22.49² =
  23. 23.29² =
  24. 24.29² =
  25. 25.21² =
  26. 26.21² =
  27. 27.61² =
  28. 28.19² =
  29. 29.89² =
  30. 30.41² =
  31. 31.19² =
  32. 32.81² =
  33. 33.91² =
  34. 34.41² =
  35. 35.61² =
  36. 36.39² =
  37. 37.61² =
  38. 38.29² =
  39. 39.51² =
  40. 40.49² =

Answer key

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

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