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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 545 · 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. 2.31² =
  3. 3.19² =
  4. 4.51² =
  5. 5.79² =
  6. 6.59² =
  7. 7.51² =
  8. 8.41² =
  9. 9.29² =
  10. 10.71² =
  11. 11.29² =
  12. 12.69² =
  13. 13.21² =
  14. 14.19² =
  15. 15.21² =
  16. 16.39² =
  17. 17.59² =
  18. 18.39² =
  19. 19.89² =
  20. 20.89² =
  21. 21.49² =
  22. 22.51² =
  23. 23.69² =
  24. 24.41² =
  25. 25.31² =
  26. 26.31² =
  27. 27.61² =
  28. 28.31² =
  29. 29.61² =
  30. 30.51² =
  31. 31.29² =
  32. 32.21² =
  33. 33.81² =
  34. 34.39² =
  35. 35.29² =
  36. 36.41² =
  37. 37.31² =
  38. 38.21² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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