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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 927 · 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. 1.59² =
  2. 2.91² =
  3. 3.79² =
  4. 4.29² =
  5. 5.21² =
  6. 6.31² =
  7. 7.49² =
  8. 8.19² =
  9. 9.49² =
  10. 10.19² =
  11. 11.79² =
  12. 12.81² =
  13. 13.39² =
  14. 14.39² =
  15. 15.19² =
  16. 16.21² =
  17. 17.49² =
  18. 18.19² =
  19. 19.61² =
  20. 20.19² =
  21. 21.61² =
  22. 22.59² =
  23. 23.51² =
  24. 24.31² =
  25. 25.41² =
  26. 26.49² =
  27. 27.49² =
  28. 28.91² =
  29. 29.21² =
  30. 30.91² =
  31. 31.79² =
  32. 32.49² =
  33. 33.51² =
  34. 34.49² =
  35. 35.49² =
  36. 36.61² =
  37. 37.71² =
  38. 38.19² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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