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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 968 · 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. 2.51² =
  3. 3.41² =
  4. 4.79² =
  5. 5.29² =
  6. 6.49² =
  7. 7.81² =
  8. 8.41² =
  9. 9.49² =
  10. 10.59² =
  11. 11.39² =
  12. 12.21² =
  13. 13.89² =
  14. 14.61² =
  15. 15.91² =
  16. 16.21² =
  17. 17.51² =
  18. 18.29² =
  19. 19.19² =
  20. 20.39² =
  21. 21.89² =
  22. 22.19² =
  23. 23.51² =
  24. 24.89² =
  25. 25.19² =
  26. 26.69² =
  27. 27.69² =
  28. 28.81² =
  29. 29.19² =
  30. 30.21² =
  31. 31.19² =
  32. 32.49² =
  33. 33.21² =
  34. 34.79² =
  35. 35.21² =
  36. 36.31² =
  37. 37.39² =
  38. 38.51² =
  39. 39.51² =
  40. 40.69² =

Answer key

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

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