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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 971 · 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. 2.49² =
  3. 3.31² =
  4. 4.69² =
  5. 5.19² =
  6. 6.41² =
  7. 7.51² =
  8. 8.51² =
  9. 9.59² =
  10. 10.39² =
  11. 11.49² =
  12. 12.59² =
  13. 13.59² =
  14. 14.39² =
  15. 15.51² =
  16. 16.19² =
  17. 17.61² =
  18. 18.79² =
  19. 19.91² =
  20. 20.89² =
  21. 21.69² =
  22. 22.91² =
  23. 23.19² =
  24. 24.19² =
  25. 25.31² =
  26. 26.29² =
  27. 27.79² =
  28. 28.39² =
  29. 29.21² =
  30. 30.59² =
  31. 31.59² =
  32. 32.39² =
  33. 33.69² =
  34. 34.89² =
  35. 35.21² =
  36. 36.91² =
  37. 37.41² =
  38. 38.61² =
  39. 39.89² =
  40. 40.29² =

Answer key

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

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