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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 944 · 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. 1.61² =
  2. 2.19² =
  3. 3.41² =
  4. 4.69² =
  5. 5.69² =
  6. 6.39² =
  7. 7.51² =
  8. 8.29² =
  9. 9.49² =
  10. 10.39² =
  11. 11.21² =
  12. 12.91² =
  13. 13.71² =
  14. 14.89² =
  15. 15.81² =
  16. 16.21² =
  17. 17.31² =
  18. 18.29² =
  19. 19.29² =
  20. 20.39² =
  21. 21.69² =
  22. 22.59² =
  23. 23.49² =
  24. 24.49² =
  25. 25.59² =
  26. 26.19² =
  27. 27.29² =
  28. 28.41² =
  29. 29.29² =
  30. 30.41² =
  31. 31.81² =
  32. 32.59² =
  33. 33.19² =
  34. 34.69² =
  35. 35.29² =
  36. 36.69² =
  37. 37.71² =
  38. 38.71² =
  39. 39.51² =
  40. 40.39² =

Answer key

  1. 3721
  2. 361
  3. 1681
  4. 4761
  5. 4761
  6. 1521
  7. 2601
  8. 841
  9. 2401
  10. 1521
  11. 441
  12. 8281
  13. 5041
  14. 7921
  15. 6561
  16. 441
  17. 961
  18. 841
  19. 841
  20. 1521
  21. 4761
  22. 3481
  23. 2401
  24. 2401
  25. 3481
  26. 361
  27. 841
  28. 1681
  29. 841
  30. 1681
  31. 6561
  32. 3481
  33. 361
  34. 4761
  35. 841
  36. 4761
  37. 5041
  38. 5041
  39. 2601
  40. 1521

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