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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 895 · 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. 2.31² =
  3. 3.81² =
  4. 4.41² =
  5. 5.51² =
  6. 6.69² =
  7. 7.41² =
  8. 8.59² =
  9. 9.91² =
  10. 10.89² =
  11. 11.49² =
  12. 12.51² =
  13. 13.59² =
  14. 14.69² =
  15. 15.59² =
  16. 16.81² =
  17. 17.81² =
  18. 18.21² =
  19. 19.31² =
  20. 20.81² =
  21. 21.71² =
  22. 22.19² =
  23. 23.71² =
  24. 24.79² =
  25. 25.71² =
  26. 26.21² =
  27. 27.69² =
  28. 28.69² =
  29. 29.61² =
  30. 30.91² =
  31. 31.61² =
  32. 32.29² =
  33. 33.31² =
  34. 34.31² =
  35. 35.91² =
  36. 36.69² =
  37. 37.71² =
  38. 38.21² =
  39. 39.51² =
  40. 40.19² =

Answer key

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

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