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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 85 · 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. 1.51² =
  2. 2.51² =
  3. 3.31² =
  4. 4.79² =
  5. 5.49² =
  6. 6.31² =
  7. 7.69² =
  8. 8.81² =
  9. 9.31² =
  10. 10.31² =
  11. 11.31² =
  12. 12.41² =
  13. 13.29² =
  14. 14.29² =
  15. 15.89² =
  16. 16.29² =
  17. 17.71² =
  18. 18.41² =
  19. 19.51² =
  20. 20.91² =
  21. 21.41² =
  22. 22.19² =
  23. 23.61² =
  24. 24.29² =
  25. 25.41² =
  26. 26.31² =
  27. 27.59² =
  28. 28.21² =
  29. 29.29² =
  30. 30.31² =
  31. 31.61² =
  32. 32.21² =
  33. 33.79² =
  34. 34.29² =
  35. 35.21² =
  36. 36.49² =
  37. 37.21² =
  38. 38.79² =
  39. 39.69² =
  40. 40.81² =

Answer key

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

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