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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 788 · 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. 1.89² =
  2. 2.51² =
  3. 3.21² =
  4. 4.31² =
  5. 5.69² =
  6. 6.69² =
  7. 7.19² =
  8. 8.31² =
  9. 9.51² =
  10. 10.61² =
  11. 11.61² =
  12. 12.29² =
  13. 13.39² =
  14. 14.59² =
  15. 15.49² =
  16. 16.89² =
  17. 17.31² =
  18. 18.61² =
  19. 19.39² =
  20. 20.89² =
  21. 21.71² =
  22. 22.41² =
  23. 23.81² =
  24. 24.31² =
  25. 25.81² =
  26. 26.59² =
  27. 27.29² =
  28. 28.39² =
  29. 29.29² =
  30. 30.69² =
  31. 31.91² =
  32. 32.81² =
  33. 33.49² =
  34. 34.41² =
  35. 35.59² =
  36. 36.39² =
  37. 37.51² =
  38. 38.39² =
  39. 39.59² =
  40. 40.49² =

Answer key

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

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