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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 561 · 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. 1.59² =
  2. 2.51² =
  3. 3.49² =
  4. 4.61² =
  5. 5.19² =
  6. 6.81² =
  7. 7.59² =
  8. 8.29² =
  9. 9.29² =
  10. 10.31² =
  11. 11.89² =
  12. 12.51² =
  13. 13.59² =
  14. 14.89² =
  15. 15.29² =
  16. 16.89² =
  17. 17.19² =
  18. 18.19² =
  19. 19.31² =
  20. 20.79² =
  21. 21.61² =
  22. 22.51² =
  23. 23.51² =
  24. 24.39² =
  25. 25.69² =
  26. 26.69² =
  27. 27.41² =
  28. 28.69² =
  29. 29.91² =
  30. 30.19² =
  31. 31.21² =
  32. 32.79² =
  33. 33.69² =
  34. 34.21² =
  35. 35.21² =
  36. 36.81² =
  37. 37.39² =
  38. 38.61² =
  39. 39.21² =
  40. 40.49² =

Answer key

  1. 3481
  2. 2601
  3. 2401
  4. 3721
  5. 361
  6. 6561
  7. 3481
  8. 841
  9. 841
  10. 961
  11. 7921
  12. 2601
  13. 3481
  14. 7921
  15. 841
  16. 7921
  17. 361
  18. 361
  19. 961
  20. 6241
  21. 3721
  22. 2601
  23. 2601
  24. 1521
  25. 4761
  26. 4761
  27. 1681
  28. 4761
  29. 8281
  30. 361
  31. 441
  32. 6241
  33. 4761
  34. 441
  35. 441
  36. 6561
  37. 1521
  38. 3721
  39. 441
  40. 2401

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