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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 245 · 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. 1.79² =
  2. 2.61² =
  3. 3.89² =
  4. 4.21² =
  5. 5.89² =
  6. 6.29² =
  7. 7.69² =
  8. 8.21² =
  9. 9.81² =
  10. 10.61² =
  11. 11.51² =
  12. 12.61² =
  13. 13.89² =
  14. 14.61² =
  15. 15.59² =
  16. 16.51² =
  17. 17.91² =
  18. 18.51² =
  19. 19.61² =
  20. 20.91² =
  21. 21.91² =
  22. 22.21² =
  23. 23.81² =
  24. 24.39² =
  25. 25.51² =
  26. 26.79² =
  27. 27.59² =
  28. 28.31² =
  29. 29.29² =
  30. 30.91² =
  31. 31.91² =
  32. 32.81² =
  33. 33.29² =
  34. 34.31² =
  35. 35.91² =
  36. 36.61² =
  37. 37.79² =
  38. 38.81² =
  39. 39.59² =
  40. 40.49² =

Answer key

  1. 6241
  2. 3721
  3. 7921
  4. 441
  5. 7921
  6. 841
  7. 4761
  8. 441
  9. 6561
  10. 3721
  11. 2601
  12. 3721
  13. 7921
  14. 3721
  15. 3481
  16. 2601
  17. 8281
  18. 2601
  19. 3721
  20. 8281
  21. 8281
  22. 441
  23. 6561
  24. 1521
  25. 2601
  26. 6241
  27. 3481
  28. 961
  29. 841
  30. 8281
  31. 8281
  32. 6561
  33. 841
  34. 961
  35. 8281
  36. 3721
  37. 6241
  38. 6561
  39. 3481
  40. 2401

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