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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 985 · 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. 1.79² =
  2. 2.51² =
  3. 3.69² =
  4. 4.19² =
  5. 5.39² =
  6. 6.51² =
  7. 7.49² =
  8. 8.59² =
  9. 9.19² =
  10. 10.31² =
  11. 11.29² =
  12. 12.91² =
  13. 13.19² =
  14. 14.69² =
  15. 15.21² =
  16. 16.49² =
  17. 17.39² =
  18. 18.69² =
  19. 19.29² =
  20. 20.21² =
  21. 21.21² =
  22. 22.49² =
  23. 23.91² =
  24. 24.89² =
  25. 25.21² =
  26. 26.39² =
  27. 27.61² =
  28. 28.69² =
  29. 29.29² =
  30. 30.31² =
  31. 31.29² =
  32. 32.59² =
  33. 33.81² =
  34. 34.89² =
  35. 35.49² =
  36. 36.49² =
  37. 37.29² =
  38. 38.51² =
  39. 39.59² =
  40. 40.41² =

Answer key

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

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