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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 919 · 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. 1.51² =
  2. 2.91² =
  3. 3.19² =
  4. 4.61² =
  5. 5.29² =
  6. 6.79² =
  7. 7.21² =
  8. 8.19² =
  9. 9.59² =
  10. 10.19² =
  11. 11.79² =
  12. 12.81² =
  13. 13.39² =
  14. 14.49² =
  15. 15.49² =
  16. 16.41² =
  17. 17.39² =
  18. 18.81² =
  19. 19.31² =
  20. 20.89² =
  21. 21.69² =
  22. 22.91² =
  23. 23.91² =
  24. 24.19² =
  25. 25.41² =
  26. 26.29² =
  27. 27.41² =
  28. 28.49² =
  29. 29.61² =
  30. 30.89² =
  31. 31.29² =
  32. 32.21² =
  33. 33.29² =
  34. 34.41² =
  35. 35.39² =
  36. 36.81² =
  37. 37.41² =
  38. 38.91² =
  39. 39.91² =
  40. 40.29² =

Answer key

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

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