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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 252 · 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. 1.81² =
  2. 2.59² =
  3. 3.51² =
  4. 4.71² =
  5. 5.59² =
  6. 6.51² =
  7. 7.71² =
  8. 8.59² =
  9. 9.31² =
  10. 10.29² =
  11. 11.41² =
  12. 12.39² =
  13. 13.69² =
  14. 14.91² =
  15. 15.21² =
  16. 16.39² =
  17. 17.21² =
  18. 18.49² =
  19. 19.71² =
  20. 20.41² =
  21. 21.89² =
  22. 22.51² =
  23. 23.21² =
  24. 24.39² =
  25. 25.41² =
  26. 26.51² =
  27. 27.49² =
  28. 28.91² =
  29. 29.31² =
  30. 30.89² =
  31. 31.31² =
  32. 32.31² =
  33. 33.39² =
  34. 34.49² =
  35. 35.69² =
  36. 36.39² =
  37. 37.49² =
  38. 38.61² =
  39. 39.89² =
  40. 40.59² =

Answer key

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

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