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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 765 · 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. 1.59² =
  2. 2.31² =
  3. 3.19² =
  4. 4.51² =
  5. 5.89² =
  6. 6.51² =
  7. 7.29² =
  8. 8.81² =
  9. 9.19² =
  10. 10.31² =
  11. 11.19² =
  12. 12.79² =
  13. 13.29² =
  14. 14.89² =
  15. 15.21² =
  16. 16.31² =
  17. 17.31² =
  18. 18.19² =
  19. 19.31² =
  20. 20.21² =
  21. 21.71² =
  22. 22.19² =
  23. 23.51² =
  24. 24.89² =
  25. 25.29² =
  26. 26.21² =
  27. 27.91² =
  28. 28.59² =
  29. 29.29² =
  30. 30.49² =
  31. 31.39² =
  32. 32.89² =
  33. 33.41² =
  34. 34.69² =
  35. 35.79² =
  36. 36.89² =
  37. 37.61² =
  38. 38.39² =
  39. 39.39² =
  40. 40.31² =

Answer key

  1. 3481
  2. 961
  3. 361
  4. 2601
  5. 7921
  6. 2601
  7. 841
  8. 6561
  9. 361
  10. 961
  11. 361
  12. 6241
  13. 841
  14. 7921
  15. 441
  16. 961
  17. 961
  18. 361
  19. 961
  20. 441
  21. 5041
  22. 361
  23. 2601
  24. 7921
  25. 841
  26. 441
  27. 8281
  28. 3481
  29. 841
  30. 2401
  31. 1521
  32. 7921
  33. 1681
  34. 4761
  35. 6241
  36. 7921
  37. 3721
  38. 1521
  39. 1521
  40. 961

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