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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 922 · 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. 2.41² =
  3. 3.29² =
  4. 4.21² =
  5. 5.51² =
  6. 6.31² =
  7. 7.69² =
  8. 8.69² =
  9. 9.81² =
  10. 10.51² =
  11. 11.39² =
  12. 12.31² =
  13. 13.21² =
  14. 14.19² =
  15. 15.51² =
  16. 16.31² =
  17. 17.49² =
  18. 18.81² =
  19. 19.49² =
  20. 20.21² =
  21. 21.79² =
  22. 22.61² =
  23. 23.91² =
  24. 24.21² =
  25. 25.59² =
  26. 26.29² =
  27. 27.79² =
  28. 28.81² =
  29. 29.39² =
  30. 30.29² =
  31. 31.29² =
  32. 32.29² =
  33. 33.29² =
  34. 34.69² =
  35. 35.59² =
  36. 36.29² =
  37. 37.21² =
  38. 38.61² =
  39. 39.71² =
  40. 40.79² =

Answer key

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

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