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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 939 · 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. 1.41² =
  2. 2.29² =
  3. 3.21² =
  4. 4.49² =
  5. 5.31² =
  6. 6.89² =
  7. 7.59² =
  8. 8.91² =
  9. 9.31² =
  10. 10.41² =
  11. 11.69² =
  12. 12.19² =
  13. 13.39² =
  14. 14.29² =
  15. 15.59² =
  16. 16.41² =
  17. 17.49² =
  18. 18.49² =
  19. 19.21² =
  20. 20.31² =
  21. 21.31² =
  22. 22.69² =
  23. 23.31² =
  24. 24.41² =
  25. 25.81² =
  26. 26.51² =
  27. 27.49² =
  28. 28.19² =
  29. 29.91² =
  30. 30.41² =
  31. 31.59² =
  32. 32.71² =
  33. 33.19² =
  34. 34.89² =
  35. 35.21² =
  36. 36.81² =
  37. 37.31² =
  38. 38.19² =
  39. 39.59² =
  40. 40.19² =

Answer key

  1. 1681
  2. 841
  3. 441
  4. 2401
  5. 961
  6. 7921
  7. 3481
  8. 8281
  9. 961
  10. 1681
  11. 4761
  12. 361
  13. 1521
  14. 841
  15. 3481
  16. 1681
  17. 2401
  18. 2401
  19. 441
  20. 961
  21. 961
  22. 4761
  23. 961
  24. 1681
  25. 6561
  26. 2601
  27. 2401
  28. 361
  29. 8281
  30. 1681
  31. 3481
  32. 5041
  33. 361
  34. 7921
  35. 441
  36. 6561
  37. 961
  38. 361
  39. 3481
  40. 361

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