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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 876 · 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. 1.81² =
  2. 2.79² =
  3. 3.59² =
  4. 4.29² =
  5. 5.49² =
  6. 6.41² =
  7. 7.79² =
  8. 8.91² =
  9. 9.41² =
  10. 10.29² =
  11. 11.49² =
  12. 12.31² =
  13. 13.89² =
  14. 14.31² =
  15. 15.71² =
  16. 16.41² =
  17. 17.31² =
  18. 18.39² =
  19. 19.49² =
  20. 20.81² =
  21. 21.21² =
  22. 22.19² =
  23. 23.31² =
  24. 24.61² =
  25. 25.79² =
  26. 26.71² =
  27. 27.61² =
  28. 28.89² =
  29. 29.21² =
  30. 30.89² =
  31. 31.31² =
  32. 32.59² =
  33. 33.51² =
  34. 34.61² =
  35. 35.49² =
  36. 36.61² =
  37. 37.71² =
  38. 38.29² =
  39. 39.61² =
  40. 40.59² =

Answer key

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

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