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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 958 · 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. 1.31² =
  2. 2.39² =
  3. 3.69² =
  4. 4.79² =
  5. 5.71² =
  6. 6.39² =
  7. 7.51² =
  8. 8.89² =
  9. 9.39² =
  10. 10.31² =
  11. 11.81² =
  12. 12.81² =
  13. 13.51² =
  14. 14.19² =
  15. 15.29² =
  16. 16.19² =
  17. 17.41² =
  18. 18.51² =
  19. 19.49² =
  20. 20.19² =
  21. 21.51² =
  22. 22.39² =
  23. 23.61² =
  24. 24.79² =
  25. 25.61² =
  26. 26.59² =
  27. 27.21² =
  28. 28.21² =
  29. 29.31² =
  30. 30.39² =
  31. 31.71² =
  32. 32.69² =
  33. 33.79² =
  34. 34.79² =
  35. 35.29² =
  36. 36.21² =
  37. 37.21² =
  38. 38.49² =
  39. 39.39² =
  40. 40.91² =

Answer key

  1. 961
  2. 1521
  3. 4761
  4. 6241
  5. 5041
  6. 1521
  7. 2601
  8. 7921
  9. 1521
  10. 961
  11. 6561
  12. 6561
  13. 2601
  14. 361
  15. 841
  16. 361
  17. 1681
  18. 2601
  19. 2401
  20. 361
  21. 2601
  22. 1521
  23. 3721
  24. 6241
  25. 3721
  26. 3481
  27. 441
  28. 441
  29. 961
  30. 1521
  31. 5041
  32. 4761
  33. 6241
  34. 6241
  35. 841
  36. 441
  37. 441
  38. 2401
  39. 1521
  40. 8281

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