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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 896 · 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. 1.21² =
  2. 2.31² =
  3. 3.79² =
  4. 4.89² =
  5. 5.79² =
  6. 6.21² =
  7. 7.69² =
  8. 8.21² =
  9. 9.21² =
  10. 10.69² =
  11. 11.29² =
  12. 12.91² =
  13. 13.31² =
  14. 14.19² =
  15. 15.49² =
  16. 16.29² =
  17. 17.49² =
  18. 18.31² =
  19. 19.49² =
  20. 20.91² =
  21. 21.79² =
  22. 22.51² =
  23. 23.29² =
  24. 24.81² =
  25. 25.29² =
  26. 26.91² =
  27. 27.31² =
  28. 28.39² =
  29. 29.59² =
  30. 30.51² =
  31. 31.79² =
  32. 32.21² =
  33. 33.31² =
  34. 34.31² =
  35. 35.91² =
  36. 36.19² =
  37. 37.81² =
  38. 38.31² =
  39. 39.21² =
  40. 40.71² =

Answer key

  1. 441
  2. 961
  3. 6241
  4. 7921
  5. 6241
  6. 441
  7. 4761
  8. 441
  9. 441
  10. 4761
  11. 841
  12. 8281
  13. 961
  14. 361
  15. 2401
  16. 841
  17. 2401
  18. 961
  19. 2401
  20. 8281
  21. 6241
  22. 2601
  23. 841
  24. 6561
  25. 841
  26. 8281
  27. 961
  28. 1521
  29. 3481
  30. 2601
  31. 6241
  32. 441
  33. 961
  34. 961
  35. 8281
  36. 361
  37. 6561
  38. 961
  39. 441
  40. 5041

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