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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 973 · 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. 2.89² =
  3. 3.41² =
  4. 4.91² =
  5. 5.29² =
  6. 6.31² =
  7. 7.61² =
  8. 8.89² =
  9. 9.41² =
  10. 10.39² =
  11. 11.21² =
  12. 12.19² =
  13. 13.41² =
  14. 14.51² =
  15. 15.39² =
  16. 16.39² =
  17. 17.91² =
  18. 18.71² =
  19. 19.71² =
  20. 20.19² =
  21. 21.41² =
  22. 22.49² =
  23. 23.61² =
  24. 24.49² =
  25. 25.61² =
  26. 26.21² =
  27. 27.81² =
  28. 28.69² =
  29. 29.61² =
  30. 30.39² =
  31. 31.51² =
  32. 32.29² =
  33. 33.71² =
  34. 34.19² =
  35. 35.39² =
  36. 36.71² =
  37. 37.49² =
  38. 38.59² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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