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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 981 · 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. 1.41² =
  2. 2.49² =
  3. 3.39² =
  4. 4.69² =
  5. 5.81² =
  6. 6.29² =
  7. 7.89² =
  8. 8.19² =
  9. 9.81² =
  10. 10.89² =
  11. 11.69² =
  12. 12.51² =
  13. 13.61² =
  14. 14.49² =
  15. 15.29² =
  16. 16.29² =
  17. 17.39² =
  18. 18.59² =
  19. 19.69² =
  20. 20.31² =
  21. 21.21² =
  22. 22.39² =
  23. 23.49² =
  24. 24.89² =
  25. 25.81² =
  26. 26.29² =
  27. 27.61² =
  28. 28.49² =
  29. 29.71² =
  30. 30.71² =
  31. 31.41² =
  32. 32.81² =
  33. 33.21² =
  34. 34.61² =
  35. 35.61² =
  36. 36.71² =
  37. 37.89² =
  38. 38.89² =
  39. 39.81² =
  40. 40.81² =

Answer key

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

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