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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 898 · 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. 1.59² =
  2. 2.89² =
  3. 3.29² =
  4. 4.69² =
  5. 5.49² =
  6. 6.41² =
  7. 7.79² =
  8. 8.31² =
  9. 9.49² =
  10. 10.71² =
  11. 11.21² =
  12. 12.61² =
  13. 13.41² =
  14. 14.19² =
  15. 15.31² =
  16. 16.79² =
  17. 17.39² =
  18. 18.29² =
  19. 19.91² =
  20. 20.31² =
  21. 21.61² =
  22. 22.41² =
  23. 23.59² =
  24. 24.59² =
  25. 25.21² =
  26. 26.51² =
  27. 27.81² =
  28. 28.51² =
  29. 29.89² =
  30. 30.69² =
  31. 31.69² =
  32. 32.29² =
  33. 33.89² =
  34. 34.61² =
  35. 35.41² =
  36. 36.29² =
  37. 37.71² =
  38. 38.81² =
  39. 39.91² =
  40. 40.69² =

Answer key

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

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