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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 879 · 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. 1.31² =
  2. 2.21² =
  3. 3.59² =
  4. 4.39² =
  5. 5.69² =
  6. 6.89² =
  7. 7.29² =
  8. 8.59² =
  9. 9.41² =
  10. 10.19² =
  11. 11.21² =
  12. 12.31² =
  13. 13.51² =
  14. 14.61² =
  15. 15.29² =
  16. 16.41² =
  17. 17.69² =
  18. 18.49² =
  19. 19.19² =
  20. 20.69² =
  21. 21.29² =
  22. 22.71² =
  23. 23.49² =
  24. 24.89² =
  25. 25.39² =
  26. 26.69² =
  27. 27.21² =
  28. 28.91² =
  29. 29.61² =
  30. 30.81² =
  31. 31.51² =
  32. 32.89² =
  33. 33.69² =
  34. 34.29² =
  35. 35.29² =
  36. 36.49² =
  37. 37.81² =
  38. 38.49² =
  39. 39.29² =
  40. 40.79² =

Answer key

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

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