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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 979 · 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. 1.21² =
  2. 2.19² =
  3. 3.71² =
  4. 4.61² =
  5. 5.69² =
  6. 6.29² =
  7. 7.29² =
  8. 8.19² =
  9. 9.49² =
  10. 10.49² =
  11. 11.51² =
  12. 12.59² =
  13. 13.41² =
  14. 14.51² =
  15. 15.89² =
  16. 16.91² =
  17. 17.29² =
  18. 18.51² =
  19. 19.31² =
  20. 20.69² =
  21. 21.71² =
  22. 22.69² =
  23. 23.29² =
  24. 24.59² =
  25. 25.49² =
  26. 26.21² =
  27. 27.29² =
  28. 28.71² =
  29. 29.41² =
  30. 30.41² =
  31. 31.59² =
  32. 32.89² =
  33. 33.31² =
  34. 34.69² =
  35. 35.29² =
  36. 36.59² =
  37. 37.89² =
  38. 38.61² =
  39. 39.41² =
  40. 40.39² =

Answer key

  1. 441
  2. 361
  3. 5041
  4. 3721
  5. 4761
  6. 841
  7. 841
  8. 361
  9. 2401
  10. 2401
  11. 2601
  12. 3481
  13. 1681
  14. 2601
  15. 7921
  16. 8281
  17. 841
  18. 2601
  19. 961
  20. 4761
  21. 5041
  22. 4761
  23. 841
  24. 3481
  25. 2401
  26. 441
  27. 841
  28. 5041
  29. 1681
  30. 1681
  31. 3481
  32. 7921
  33. 961
  34. 4761
  35. 841
  36. 3481
  37. 7921
  38. 3721
  39. 1681
  40. 1521

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