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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 812 · 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. 1.91² =
  2. 2.71² =
  3. 3.29² =
  4. 4.91² =
  5. 5.39² =
  6. 6.21² =
  7. 7.81² =
  8. 8.21² =
  9. 9.31² =
  10. 10.39² =
  11. 11.41² =
  12. 12.19² =
  13. 13.81² =
  14. 14.89² =
  15. 15.61² =
  16. 16.71² =
  17. 17.51² =
  18. 18.69² =
  19. 19.39² =
  20. 20.51² =
  21. 21.39² =
  22. 22.81² =
  23. 23.71² =
  24. 24.31² =
  25. 25.91² =
  26. 26.61² =
  27. 27.71² =
  28. 28.81² =
  29. 29.59² =
  30. 30.49² =
  31. 31.31² =
  32. 32.61² =
  33. 33.49² =
  34. 34.51² =
  35. 35.39² =
  36. 36.49² =
  37. 37.29² =
  38. 38.81² =
  39. 39.39² =
  40. 40.31² =

Answer key

  1. 8281
  2. 5041
  3. 841
  4. 8281
  5. 1521
  6. 441
  7. 6561
  8. 441
  9. 961
  10. 1521
  11. 1681
  12. 361
  13. 6561
  14. 7921
  15. 3721
  16. 5041
  17. 2601
  18. 4761
  19. 1521
  20. 2601
  21. 1521
  22. 6561
  23. 5041
  24. 961
  25. 8281
  26. 3721
  27. 5041
  28. 6561
  29. 3481
  30. 2401
  31. 961
  32. 3721
  33. 2401
  34. 2601
  35. 1521
  36. 2401
  37. 841
  38. 6561
  39. 1521
  40. 961

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