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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 4 · 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. 1.41² =
  2. 2.59² =
  3. 3.49² =
  4. 4.81² =
  5. 5.31² =
  6. 6.91² =
  7. 7.39² =
  8. 8.51² =
  9. 9.29² =
  10. 10.41² =
  11. 11.41² =
  12. 12.29² =
  13. 13.61² =
  14. 14.19² =
  15. 15.31² =
  16. 16.51² =
  17. 17.41² =
  18. 18.51² =
  19. 19.29² =
  20. 20.39² =
  21. 21.41² =
  22. 22.41² =
  23. 23.31² =
  24. 24.39² =
  25. 25.21² =
  26. 26.39² =
  27. 27.81² =
  28. 28.49² =
  29. 29.61² =
  30. 30.89² =
  31. 31.31² =
  32. 32.21² =
  33. 33.41² =
  34. 34.39² =
  35. 35.51² =
  36. 36.31² =
  37. 37.79² =
  38. 38.89² =
  39. 39.21² =
  40. 40.39² =

Answer key

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

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