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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 933 · 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. 1.51² =
  2. 2.49² =
  3. 3.91² =
  4. 4.39² =
  5. 5.39² =
  6. 6.79² =
  7. 7.79² =
  8. 8.71² =
  9. 9.51² =
  10. 10.31² =
  11. 11.89² =
  12. 12.59² =
  13. 13.31² =
  14. 14.51² =
  15. 15.31² =
  16. 16.79² =
  17. 17.21² =
  18. 18.61² =
  19. 19.49² =
  20. 20.19² =
  21. 21.51² =
  22. 22.51² =
  23. 23.19² =
  24. 24.79² =
  25. 25.61² =
  26. 26.31² =
  27. 27.19² =
  28. 28.59² =
  29. 29.39² =
  30. 30.19² =
  31. 31.71² =
  32. 32.29² =
  33. 33.91² =
  34. 34.29² =
  35. 35.41² =
  36. 36.41² =
  37. 37.91² =
  38. 38.81² =
  39. 39.19² =
  40. 40.89² =

Answer key

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

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