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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 513 · 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. 2.89² =
  3. 3.29² =
  4. 4.51² =
  5. 5.59² =
  6. 6.51² =
  7. 7.89² =
  8. 8.59² =
  9. 9.81² =
  10. 10.39² =
  11. 11.81² =
  12. 12.81² =
  13. 13.59² =
  14. 14.91² =
  15. 15.91² =
  16. 16.21² =
  17. 17.59² =
  18. 18.59² =
  19. 19.31² =
  20. 20.81² =
  21. 21.89² =
  22. 22.29² =
  23. 23.49² =
  24. 24.51² =
  25. 25.89² =
  26. 26.81² =
  27. 27.51² =
  28. 28.59² =
  29. 29.69² =
  30. 30.61² =
  31. 31.81² =
  32. 32.61² =
  33. 33.39² =
  34. 34.59² =
  35. 35.21² =
  36. 36.69² =
  37. 37.59² =
  38. 38.69² =
  39. 39.71² =
  40. 40.49² =

Answer key

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

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