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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 914 · 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. 1.91² =
  2. 2.71² =
  3. 3.89² =
  4. 4.19² =
  5. 5.41² =
  6. 6.19² =
  7. 7.31² =
  8. 8.51² =
  9. 9.79² =
  10. 10.49² =
  11. 11.59² =
  12. 12.19² =
  13. 13.31² =
  14. 14.59² =
  15. 15.81² =
  16. 16.51² =
  17. 17.89² =
  18. 18.19² =
  19. 19.69² =
  20. 20.89² =
  21. 21.39² =
  22. 22.91² =
  23. 23.29² =
  24. 24.49² =
  25. 25.61² =
  26. 26.91² =
  27. 27.29² =
  28. 28.61² =
  29. 29.81² =
  30. 30.91² =
  31. 31.59² =
  32. 32.91² =
  33. 33.31² =
  34. 34.31² =
  35. 35.59² =
  36. 36.49² =
  37. 37.59² =
  38. 38.19² =
  39. 39.31² =
  40. 40.91² =

Answer key

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

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