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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 632 · 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. 1.61² =
  2. 2.91² =
  3. 3.89² =
  4. 4.81² =
  5. 5.31² =
  6. 6.59² =
  7. 7.31² =
  8. 8.39² =
  9. 9.61² =
  10. 10.21² =
  11. 11.89² =
  12. 12.31² =
  13. 13.81² =
  14. 14.59² =
  15. 15.41² =
  16. 16.59² =
  17. 17.39² =
  18. 18.81² =
  19. 19.31² =
  20. 20.21² =
  21. 21.79² =
  22. 22.89² =
  23. 23.81² =
  24. 24.41² =
  25. 25.21² =
  26. 26.29² =
  27. 27.61² =
  28. 28.79² =
  29. 29.41² =
  30. 30.31² =
  31. 31.49² =
  32. 32.51² =
  33. 33.69² =
  34. 34.29² =
  35. 35.69² =
  36. 36.39² =
  37. 37.31² =
  38. 38.29² =
  39. 39.39² =
  40. 40.69² =

Answer key

  1. 3721
  2. 8281
  3. 7921
  4. 6561
  5. 961
  6. 3481
  7. 961
  8. 1521
  9. 3721
  10. 441
  11. 7921
  12. 961
  13. 6561
  14. 3481
  15. 1681
  16. 3481
  17. 1521
  18. 6561
  19. 961
  20. 441
  21. 6241
  22. 7921
  23. 6561
  24. 1681
  25. 441
  26. 841
  27. 3721
  28. 6241
  29. 1681
  30. 961
  31. 2401
  32. 2601
  33. 4761
  34. 841
  35. 4761
  36. 1521
  37. 961
  38. 841
  39. 1521
  40. 4761

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