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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 522 · 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. 2.29² =
  3. 3.29² =
  4. 4.31² =
  5. 5.49² =
  6. 6.39² =
  7. 7.91² =
  8. 8.51² =
  9. 9.69² =
  10. 10.71² =
  11. 11.71² =
  12. 12.39² =
  13. 13.29² =
  14. 14.59² =
  15. 15.31² =
  16. 16.49² =
  17. 17.49² =
  18. 18.69² =
  19. 19.61² =
  20. 20.91² =
  21. 21.89² =
  22. 22.81² =
  23. 23.49² =
  24. 24.81² =
  25. 25.21² =
  26. 26.21² =
  27. 27.69² =
  28. 28.19² =
  29. 29.59² =
  30. 30.21² =
  31. 31.31² =
  32. 32.61² =
  33. 33.81² =
  34. 34.21² =
  35. 35.81² =
  36. 36.39² =
  37. 37.61² =
  38. 38.51² =
  39. 39.19² =
  40. 40.49² =

Answer key

  1. 361
  2. 841
  3. 841
  4. 961
  5. 2401
  6. 1521
  7. 8281
  8. 2601
  9. 4761
  10. 5041
  11. 5041
  12. 1521
  13. 841
  14. 3481
  15. 961
  16. 2401
  17. 2401
  18. 4761
  19. 3721
  20. 8281
  21. 7921
  22. 6561
  23. 2401
  24. 6561
  25. 441
  26. 441
  27. 4761
  28. 361
  29. 3481
  30. 441
  31. 961
  32. 3721
  33. 6561
  34. 441
  35. 6561
  36. 1521
  37. 3721
  38. 2601
  39. 361
  40. 2401

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