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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 913 · 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. 1.49² =
  2. 2.39² =
  3. 3.51² =
  4. 4.21² =
  5. 5.41² =
  6. 6.29² =
  7. 7.29² =
  8. 8.41² =
  9. 9.49² =
  10. 10.21² =
  11. 11.31² =
  12. 12.89² =
  13. 13.61² =
  14. 14.19² =
  15. 15.51² =
  16. 16.31² =
  17. 17.49² =
  18. 18.91² =
  19. 19.59² =
  20. 20.49² =
  21. 21.59² =
  22. 22.51² =
  23. 23.79² =
  24. 24.31² =
  25. 25.89² =
  26. 26.29² =
  27. 27.31² =
  28. 28.91² =
  29. 29.91² =
  30. 30.49² =
  31. 31.39² =
  32. 32.51² =
  33. 33.41² =
  34. 34.19² =
  35. 35.19² =
  36. 36.71² =
  37. 37.71² =
  38. 38.31² =
  39. 39.69² =
  40. 40.91² =

Answer key

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

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