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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 888 · 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. 1.39² =
  2. 2.51² =
  3. 3.21² =
  4. 4.91² =
  5. 5.51² =
  6. 6.19² =
  7. 7.31² =
  8. 8.81² =
  9. 9.51² =
  10. 10.31² =
  11. 11.71² =
  12. 12.61² =
  13. 13.81² =
  14. 14.41² =
  15. 15.59² =
  16. 16.81² =
  17. 17.19² =
  18. 18.89² =
  19. 19.49² =
  20. 20.51² =
  21. 21.19² =
  22. 22.19² =
  23. 23.19² =
  24. 24.31² =
  25. 25.91² =
  26. 26.79² =
  27. 27.39² =
  28. 28.39² =
  29. 29.31² =
  30. 30.41² =
  31. 31.71² =
  32. 32.79² =
  33. 33.91² =
  34. 34.29² =
  35. 35.69² =
  36. 36.81² =
  37. 37.69² =
  38. 38.89² =
  39. 39.21² =
  40. 40.51² =

Answer key

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

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