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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 975 · 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. 1.19² =
  2. 2.61² =
  3. 3.29² =
  4. 4.89² =
  5. 5.39² =
  6. 6.49² =
  7. 7.71² =
  8. 8.29² =
  9. 9.41² =
  10. 10.51² =
  11. 11.91² =
  12. 12.19² =
  13. 13.89² =
  14. 14.19² =
  15. 15.31² =
  16. 16.51² =
  17. 17.79² =
  18. 18.61² =
  19. 19.61² =
  20. 20.49² =
  21. 21.39² =
  22. 22.19² =
  23. 23.21² =
  24. 24.41² =
  25. 25.51² =
  26. 26.81² =
  27. 27.69² =
  28. 28.61² =
  29. 29.59² =
  30. 30.21² =
  31. 31.59² =
  32. 32.69² =
  33. 33.19² =
  34. 34.31² =
  35. 35.61² =
  36. 36.59² =
  37. 37.31² =
  38. 38.71² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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