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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 886 · 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. 2.31² =
  3. 3.61² =
  4. 4.81² =
  5. 5.81² =
  6. 6.59² =
  7. 7.71² =
  8. 8.21² =
  9. 9.51² =
  10. 10.19² =
  11. 11.71² =
  12. 12.19² =
  13. 13.69² =
  14. 14.49² =
  15. 15.71² =
  16. 16.59² =
  17. 17.61² =
  18. 18.29² =
  19. 19.89² =
  20. 20.49² =
  21. 21.81² =
  22. 22.69² =
  23. 23.59² =
  24. 24.69² =
  25. 25.71² =
  26. 26.79² =
  27. 27.29² =
  28. 28.51² =
  29. 29.71² =
  30. 30.51² =
  31. 31.81² =
  32. 32.91² =
  33. 33.19² =
  34. 34.61² =
  35. 35.69² =
  36. 36.49² =
  37. 37.29² =
  38. 38.89² =
  39. 39.91² =
  40. 40.31² =

Answer key

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

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