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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 941 · 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. 2.49² =
  3. 3.71² =
  4. 4.21² =
  5. 5.79² =
  6. 6.29² =
  7. 7.59² =
  8. 8.61² =
  9. 9.51² =
  10. 10.89² =
  11. 11.49² =
  12. 12.49² =
  13. 13.91² =
  14. 14.61² =
  15. 15.21² =
  16. 16.69² =
  17. 17.21² =
  18. 18.19² =
  19. 19.31² =
  20. 20.91² =
  21. 21.29² =
  22. 22.91² =
  23. 23.89² =
  24. 24.31² =
  25. 25.49² =
  26. 26.79² =
  27. 27.39² =
  28. 28.41² =
  29. 29.91² =
  30. 30.49² =
  31. 31.39² =
  32. 32.81² =
  33. 33.91² =
  34. 34.51² =
  35. 35.29² =
  36. 36.21² =
  37. 37.19² =
  38. 38.39² =
  39. 39.61² =
  40. 40.31² =

Answer key

  1. 1521
  2. 2401
  3. 5041
  4. 441
  5. 6241
  6. 841
  7. 3481
  8. 3721
  9. 2601
  10. 7921
  11. 2401
  12. 2401
  13. 8281
  14. 3721
  15. 441
  16. 4761
  17. 441
  18. 361
  19. 961
  20. 8281
  21. 841
  22. 8281
  23. 7921
  24. 961
  25. 2401
  26. 6241
  27. 1521
  28. 1681
  29. 8281
  30. 2401
  31. 1521
  32. 6561
  33. 8281
  34. 2601
  35. 841
  36. 441
  37. 361
  38. 1521
  39. 3721
  40. 961

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