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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 710 · 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. 1.81² =
  2. 2.31² =
  3. 3.59² =
  4. 4.51² =
  5. 5.39² =
  6. 6.31² =
  7. 7.31² =
  8. 8.91² =
  9. 9.49² =
  10. 10.91² =
  11. 11.91² =
  12. 12.91² =
  13. 13.21² =
  14. 14.21² =
  15. 15.29² =
  16. 16.81² =
  17. 17.61² =
  18. 18.69² =
  19. 19.31² =
  20. 20.51² =
  21. 21.61² =
  22. 22.21² =
  23. 23.59² =
  24. 24.41² =
  25. 25.29² =
  26. 26.29² =
  27. 27.21² =
  28. 28.31² =
  29. 29.91² =
  30. 30.31² =
  31. 31.39² =
  32. 32.31² =
  33. 33.79² =
  34. 34.51² =
  35. 35.91² =
  36. 36.31² =
  37. 37.49² =
  38. 38.81² =
  39. 39.29² =
  40. 40.21² =

Answer key

  1. 6561
  2. 961
  3. 3481
  4. 2601
  5. 1521
  6. 961
  7. 961
  8. 8281
  9. 2401
  10. 8281
  11. 8281
  12. 8281
  13. 441
  14. 441
  15. 841
  16. 6561
  17. 3721
  18. 4761
  19. 961
  20. 2601
  21. 3721
  22. 441
  23. 3481
  24. 1681
  25. 841
  26. 841
  27. 441
  28. 961
  29. 8281
  30. 961
  31. 1521
  32. 961
  33. 6241
  34. 2601
  35. 8281
  36. 961
  37. 2401
  38. 6561
  39. 841
  40. 441

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