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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 912 · 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. 2.19² =
  3. 3.89² =
  4. 4.71² =
  5. 5.79² =
  6. 6.89² =
  7. 7.31² =
  8. 8.79² =
  9. 9.49² =
  10. 10.21² =
  11. 11.29² =
  12. 12.51² =
  13. 13.19² =
  14. 14.71² =
  15. 15.19² =
  16. 16.91² =
  17. 17.81² =
  18. 18.41² =
  19. 19.21² =
  20. 20.51² =
  21. 21.31² =
  22. 22.39² =
  23. 23.59² =
  24. 24.89² =
  25. 25.79² =
  26. 26.39² =
  27. 27.89² =
  28. 28.89² =
  29. 29.41² =
  30. 30.79² =
  31. 31.79² =
  32. 32.49² =
  33. 33.81² =
  34. 34.71² =
  35. 35.41² =
  36. 36.59² =
  37. 37.19² =
  38. 38.71² =
  39. 39.71² =
  40. 40.49² =

Answer key

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

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