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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 706 · 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. 1.29² =
  2. 2.31² =
  3. 3.31² =
  4. 4.39² =
  5. 5.29² =
  6. 6.39² =
  7. 7.21² =
  8. 8.19² =
  9. 9.39² =
  10. 10.41² =
  11. 11.51² =
  12. 12.89² =
  13. 13.51² =
  14. 14.89² =
  15. 15.51² =
  16. 16.81² =
  17. 17.29² =
  18. 18.21² =
  19. 19.31² =
  20. 20.89² =
  21. 21.49² =
  22. 22.51² =
  23. 23.79² =
  24. 24.89² =
  25. 25.59² =
  26. 26.51² =
  27. 27.81² =
  28. 28.41² =
  29. 29.21² =
  30. 30.19² =
  31. 31.89² =
  32. 32.79² =
  33. 33.69² =
  34. 34.19² =
  35. 35.31² =
  36. 36.49² =
  37. 37.61² =
  38. 38.79² =
  39. 39.79² =
  40. 40.81² =

Answer key

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

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