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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 878 · 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. 1.39² =
  2. 2.41² =
  3. 3.61² =
  4. 4.29² =
  5. 5.31² =
  6. 6.29² =
  7. 7.91² =
  8. 8.79² =
  9. 9.51² =
  10. 10.21² =
  11. 11.51² =
  12. 12.31² =
  13. 13.79² =
  14. 14.61² =
  15. 15.41² =
  16. 16.91² =
  17. 17.19² =
  18. 18.19² =
  19. 19.19² =
  20. 20.49² =
  21. 21.91² =
  22. 22.21² =
  23. 23.19² =
  24. 24.81² =
  25. 25.91² =
  26. 26.49² =
  27. 27.51² =
  28. 28.71² =
  29. 29.79² =
  30. 30.29² =
  31. 31.81² =
  32. 32.31² =
  33. 33.61² =
  34. 34.19² =
  35. 35.81² =
  36. 36.59² =
  37. 37.71² =
  38. 38.79² =
  39. 39.91² =
  40. 40.49² =

Answer key

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

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