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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 548 · 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. 1.39² =
  2. 2.89² =
  3. 3.61² =
  4. 4.69² =
  5. 5.31² =
  6. 6.31² =
  7. 7.89² =
  8. 8.59² =
  9. 9.81² =
  10. 10.41² =
  11. 11.71² =
  12. 12.21² =
  13. 13.39² =
  14. 14.21² =
  15. 15.31² =
  16. 16.31² =
  17. 17.21² =
  18. 18.51² =
  19. 19.39² =
  20. 20.41² =
  21. 21.29² =
  22. 22.59² =
  23. 23.29² =
  24. 24.59² =
  25. 25.39² =
  26. 26.69² =
  27. 27.49² =
  28. 28.31² =
  29. 29.21² =
  30. 30.21² =
  31. 31.71² =
  32. 32.29² =
  33. 33.49² =
  34. 34.71² =
  35. 35.39² =
  36. 36.59² =
  37. 37.19² =
  38. 38.59² =
  39. 39.61² =
  40. 40.91² =

Answer key

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

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