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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 905 · 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. 1.51² =
  2. 2.41² =
  3. 3.69² =
  4. 4.89² =
  5. 5.69² =
  6. 6.79² =
  7. 7.41² =
  8. 8.59² =
  9. 9.91² =
  10. 10.21² =
  11. 11.49² =
  12. 12.31² =
  13. 13.89² =
  14. 14.51² =
  15. 15.51² =
  16. 16.89² =
  17. 17.31² =
  18. 18.61² =
  19. 19.19² =
  20. 20.49² =
  21. 21.29² =
  22. 22.29² =
  23. 23.61² =
  24. 24.31² =
  25. 25.59² =
  26. 26.59² =
  27. 27.31² =
  28. 28.79² =
  29. 29.31² =
  30. 30.21² =
  31. 31.41² =
  32. 32.69² =
  33. 33.29² =
  34. 34.19² =
  35. 35.49² =
  36. 36.49² =
  37. 37.41² =
  38. 38.41² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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