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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 930 · 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. 1.89² =
  2. 2.79² =
  3. 3.31² =
  4. 4.39² =
  5. 5.19² =
  6. 6.69² =
  7. 7.29² =
  8. 8.91² =
  9. 9.19² =
  10. 10.81² =
  11. 11.89² =
  12. 12.91² =
  13. 13.41² =
  14. 14.39² =
  15. 15.19² =
  16. 16.31² =
  17. 17.21² =
  18. 18.69² =
  19. 19.81² =
  20. 20.49² =
  21. 21.39² =
  22. 22.89² =
  23. 23.29² =
  24. 24.49² =
  25. 25.69² =
  26. 26.69² =
  27. 27.79² =
  28. 28.59² =
  29. 29.51² =
  30. 30.29² =
  31. 31.31² =
  32. 32.81² =
  33. 33.89² =
  34. 34.31² =
  35. 35.61² =
  36. 36.31² =
  37. 37.29² =
  38. 38.51² =
  39. 39.51² =
  40. 40.69² =

Answer key

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

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