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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 491 · 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. 1.79² =
  2. 2.51² =
  3. 3.91² =
  4. 4.19² =
  5. 5.31² =
  6. 6.79² =
  7. 7.79² =
  8. 8.59² =
  9. 9.79² =
  10. 10.39² =
  11. 11.39² =
  12. 12.29² =
  13. 13.51² =
  14. 14.89² =
  15. 15.21² =
  16. 16.61² =
  17. 17.29² =
  18. 18.81² =
  19. 19.59² =
  20. 20.29² =
  21. 21.41² =
  22. 22.39² =
  23. 23.41² =
  24. 24.89² =
  25. 25.29² =
  26. 26.31² =
  27. 27.71² =
  28. 28.49² =
  29. 29.21² =
  30. 30.41² =
  31. 31.69² =
  32. 32.79² =
  33. 33.49² =
  34. 34.71² =
  35. 35.31² =
  36. 36.89² =
  37. 37.69² =
  38. 38.51² =
  39. 39.39² =
  40. 40.49² =

Answer key

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

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