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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 980 · 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. 1.39² =
  2. 2.61² =
  3. 3.59² =
  4. 4.61² =
  5. 5.41² =
  6. 6.19² =
  7. 7.39² =
  8. 8.31² =
  9. 9.41² =
  10. 10.81² =
  11. 11.61² =
  12. 12.29² =
  13. 13.21² =
  14. 14.51² =
  15. 15.41² =
  16. 16.31² =
  17. 17.79² =
  18. 18.81² =
  19. 19.69² =
  20. 20.41² =
  21. 21.71² =
  22. 22.31² =
  23. 23.29² =
  24. 24.19² =
  25. 25.21² =
  26. 26.39² =
  27. 27.59² =
  28. 28.39² =
  29. 29.49² =
  30. 30.81² =
  31. 31.41² =
  32. 32.89² =
  33. 33.81² =
  34. 34.41² =
  35. 35.21² =
  36. 36.59² =
  37. 37.69² =
  38. 38.29² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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