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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 956 · 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. 2.19² =
  3. 3.19² =
  4. 4.59² =
  5. 5.79² =
  6. 6.71² =
  7. 7.41² =
  8. 8.29² =
  9. 9.31² =
  10. 10.81² =
  11. 11.59² =
  12. 12.81² =
  13. 13.31² =
  14. 14.49² =
  15. 15.29² =
  16. 16.21² =
  17. 17.69² =
  18. 18.49² =
  19. 19.81² =
  20. 20.39² =
  21. 21.81² =
  22. 22.29² =
  23. 23.29² =
  24. 24.21² =
  25. 25.49² =
  26. 26.91² =
  27. 27.89² =
  28. 28.31² =
  29. 29.19² =
  30. 30.51² =
  31. 31.69² =
  32. 32.19² =
  33. 33.59² =
  34. 34.31² =
  35. 35.39² =
  36. 36.29² =
  37. 37.61² =
  38. 38.61² =
  39. 39.69² =
  40. 40.31² =

Answer key

  1. 2601
  2. 361
  3. 361
  4. 3481
  5. 6241
  6. 5041
  7. 1681
  8. 841
  9. 961
  10. 6561
  11. 3481
  12. 6561
  13. 961
  14. 2401
  15. 841
  16. 441
  17. 4761
  18. 2401
  19. 6561
  20. 1521
  21. 6561
  22. 841
  23. 841
  24. 441
  25. 2401
  26. 8281
  27. 7921
  28. 961
  29. 361
  30. 2601
  31. 4761
  32. 361
  33. 3481
  34. 961
  35. 1521
  36. 841
  37. 3721
  38. 3721
  39. 4761
  40. 961

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