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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 978 · 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. 2.29² =
  3. 3.29² =
  4. 4.19² =
  5. 5.59² =
  6. 6.49² =
  7. 7.69² =
  8. 8.79² =
  9. 9.71² =
  10. 10.49² =
  11. 11.51² =
  12. 12.71² =
  13. 13.49² =
  14. 14.31² =
  15. 15.29² =
  16. 16.29² =
  17. 17.69² =
  18. 18.21² =
  19. 19.39² =
  20. 20.91² =
  21. 21.29² =
  22. 22.29² =
  23. 23.61² =
  24. 24.39² =
  25. 25.89² =
  26. 26.19² =
  27. 27.21² =
  28. 28.71² =
  29. 29.71² =
  30. 30.31² =
  31. 31.31² =
  32. 32.41² =
  33. 33.39² =
  34. 34.49² =
  35. 35.59² =
  36. 36.69² =
  37. 37.89² =
  38. 38.31² =
  39. 39.91² =
  40. 40.69² =

Answer key

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

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