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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 970 · 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. 1.79² =
  2. 2.41² =
  3. 3.19² =
  4. 4.29² =
  5. 5.71² =
  6. 6.49² =
  7. 7.39² =
  8. 8.81² =
  9. 9.81² =
  10. 10.91² =
  11. 11.89² =
  12. 12.89² =
  13. 13.79² =
  14. 14.41² =
  15. 15.69² =
  16. 16.69² =
  17. 17.19² =
  18. 18.41² =
  19. 19.41² =
  20. 20.19² =
  21. 21.51² =
  22. 22.89² =
  23. 23.51² =
  24. 24.31² =
  25. 25.81² =
  26. 26.51² =
  27. 27.81² =
  28. 28.21² =
  29. 29.51² =
  30. 30.29² =
  31. 31.59² =
  32. 32.19² =
  33. 33.39² =
  34. 34.21² =
  35. 35.21² =
  36. 36.81² =
  37. 37.71² =
  38. 38.81² =
  39. 39.49² =
  40. 40.39² =

Answer key

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

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