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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 906 · 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. 1.81² =
  2. 2.21² =
  3. 3.69² =
  4. 4.91² =
  5. 5.49² =
  6. 6.31² =
  7. 7.71² =
  8. 8.29² =
  9. 9.21² =
  10. 10.29² =
  11. 11.69² =
  12. 12.29² =
  13. 13.61² =
  14. 14.31² =
  15. 15.31² =
  16. 16.49² =
  17. 17.79² =
  18. 18.81² =
  19. 19.29² =
  20. 20.71² =
  21. 21.31² =
  22. 22.29² =
  23. 23.41² =
  24. 24.39² =
  25. 25.79² =
  26. 26.91² =
  27. 27.29² =
  28. 28.41² =
  29. 29.89² =
  30. 30.31² =
  31. 31.41² =
  32. 32.89² =
  33. 33.41² =
  34. 34.29² =
  35. 35.39² =
  36. 36.91² =
  37. 37.61² =
  38. 38.29² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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