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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 904 · 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. 1.71² =
  2. 2.91² =
  3. 3.41² =
  4. 4.81² =
  5. 5.69² =
  6. 6.89² =
  7. 7.89² =
  8. 8.19² =
  9. 9.91² =
  10. 10.41² =
  11. 11.59² =
  12. 12.31² =
  13. 13.61² =
  14. 14.71² =
  15. 15.41² =
  16. 16.21² =
  17. 17.59² =
  18. 18.71² =
  19. 19.29² =
  20. 20.71² =
  21. 21.89² =
  22. 22.41² =
  23. 23.61² =
  24. 24.31² =
  25. 25.71² =
  26. 26.81² =
  27. 27.89² =
  28. 28.49² =
  29. 29.41² =
  30. 30.91² =
  31. 31.71² =
  32. 32.31² =
  33. 33.71² =
  34. 34.29² =
  35. 35.69² =
  36. 36.59² =
  37. 37.49² =
  38. 38.69² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

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