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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 267 · 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. 1.49² =
  2. 2.59² =
  3. 3.89² =
  4. 4.59² =
  5. 5.19² =
  6. 6.91² =
  7. 7.39² =
  8. 8.51² =
  9. 9.89² =
  10. 10.91² =
  11. 11.51² =
  12. 12.41² =
  13. 13.39² =
  14. 14.31² =
  15. 15.81² =
  16. 16.29² =
  17. 17.31² =
  18. 18.29² =
  19. 19.21² =
  20. 20.29² =
  21. 21.39² =
  22. 22.39² =
  23. 23.21² =
  24. 24.51² =
  25. 25.61² =
  26. 26.41² =
  27. 27.31² =
  28. 28.61² =
  29. 29.91² =
  30. 30.19² =
  31. 31.89² =
  32. 32.29² =
  33. 33.41² =
  34. 34.61² =
  35. 35.81² =
  36. 36.69² =
  37. 37.89² =
  38. 38.59² =
  39. 39.61² =
  40. 40.31² =

Answer key

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

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