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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 960 · 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. 2.71² =
  3. 3.31² =
  4. 4.49² =
  5. 5.49² =
  6. 6.69² =
  7. 7.21² =
  8. 8.81² =
  9. 9.59² =
  10. 10.51² =
  11. 11.41² =
  12. 12.21² =
  13. 13.51² =
  14. 14.51² =
  15. 15.41² =
  16. 16.49² =
  17. 17.59² =
  18. 18.49² =
  19. 19.71² =
  20. 20.81² =
  21. 21.41² =
  22. 22.59² =
  23. 23.41² =
  24. 24.89² =
  25. 25.79² =
  26. 26.49² =
  27. 27.51² =
  28. 28.51² =
  29. 29.59² =
  30. 30.71² =
  31. 31.29² =
  32. 32.29² =
  33. 33.61² =
  34. 34.79² =
  35. 35.81² =
  36. 36.89² =
  37. 37.39² =
  38. 38.29² =
  39. 39.31² =
  40. 40.29² =

Answer key

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

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