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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 923 · 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. 1.61² =
  2. 2.81² =
  3. 3.61² =
  4. 4.91² =
  5. 5.29² =
  6. 6.29² =
  7. 7.71² =
  8. 8.21² =
  9. 9.69² =
  10. 10.49² =
  11. 11.19² =
  12. 12.21² =
  13. 13.39² =
  14. 14.51² =
  15. 15.59² =
  16. 16.39² =
  17. 17.89² =
  18. 18.19² =
  19. 19.69² =
  20. 20.19² =
  21. 21.31² =
  22. 22.71² =
  23. 23.19² =
  24. 24.39² =
  25. 25.91² =
  26. 26.29² =
  27. 27.39² =
  28. 28.21² =
  29. 29.31² =
  30. 30.91² =
  31. 31.91² =
  32. 32.21² =
  33. 33.61² =
  34. 34.79² =
  35. 35.59² =
  36. 36.89² =
  37. 37.69² =
  38. 38.19² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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