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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 936 · 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. 1.69² =
  2. 2.51² =
  3. 3.79² =
  4. 4.29² =
  5. 5.41² =
  6. 6.49² =
  7. 7.61² =
  8. 8.39² =
  9. 9.39² =
  10. 10.29² =
  11. 11.69² =
  12. 12.61² =
  13. 13.29² =
  14. 14.21² =
  15. 15.89² =
  16. 16.31² =
  17. 17.19² =
  18. 18.61² =
  19. 19.21² =
  20. 20.29² =
  21. 21.41² =
  22. 22.69² =
  23. 23.91² =
  24. 24.39² =
  25. 25.49² =
  26. 26.19² =
  27. 27.89² =
  28. 28.89² =
  29. 29.91² =
  30. 30.59² =
  31. 31.39² =
  32. 32.21² =
  33. 33.81² =
  34. 34.79² =
  35. 35.81² =
  36. 36.51² =
  37. 37.79² =
  38. 38.21² =
  39. 39.31² =
  40. 40.39² =

Answer key

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

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