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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 817 · 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. 1.21² =
  2. 2.81² =
  3. 3.29² =
  4. 4.79² =
  5. 5.81² =
  6. 6.39² =
  7. 7.29² =
  8. 8.79² =
  9. 9.31² =
  10. 10.49² =
  11. 11.21² =
  12. 12.29² =
  13. 13.41² =
  14. 14.31² =
  15. 15.21² =
  16. 16.41² =
  17. 17.69² =
  18. 18.59² =
  19. 19.51² =
  20. 20.59² =
  21. 21.51² =
  22. 22.79² =
  23. 23.71² =
  24. 24.21² =
  25. 25.31² =
  26. 26.89² =
  27. 27.31² =
  28. 28.59² =
  29. 29.31² =
  30. 30.29² =
  31. 31.19² =
  32. 32.41² =
  33. 33.49² =
  34. 34.81² =
  35. 35.59² =
  36. 36.69² =
  37. 37.49² =
  38. 38.89² =
  39. 39.49² =
  40. 40.49² =

Answer key

  1. 441
  2. 6561
  3. 841
  4. 6241
  5. 6561
  6. 1521
  7. 841
  8. 6241
  9. 961
  10. 2401
  11. 441
  12. 841
  13. 1681
  14. 961
  15. 441
  16. 1681
  17. 4761
  18. 3481
  19. 2601
  20. 3481
  21. 2601
  22. 6241
  23. 5041
  24. 441
  25. 961
  26. 7921
  27. 961
  28. 3481
  29. 961
  30. 841
  31. 361
  32. 1681
  33. 2401
  34. 6561
  35. 3481
  36. 4761
  37. 2401
  38. 7921
  39. 2401
  40. 2401

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