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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 741 · 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. 1.91² =
  2. 2.19² =
  3. 3.69² =
  4. 4.89² =
  5. 5.29² =
  6. 6.31² =
  7. 7.31² =
  8. 8.29² =
  9. 9.61² =
  10. 10.21² =
  11. 11.21² =
  12. 12.79² =
  13. 13.89² =
  14. 14.61² =
  15. 15.89² =
  16. 16.29² =
  17. 17.49² =
  18. 18.29² =
  19. 19.91² =
  20. 20.29² =
  21. 21.49² =
  22. 22.49² =
  23. 23.29² =
  24. 24.39² =
  25. 25.51² =
  26. 26.19² =
  27. 27.49² =
  28. 28.29² =
  29. 29.51² =
  30. 30.51² =
  31. 31.41² =
  32. 32.51² =
  33. 33.31² =
  34. 34.79² =
  35. 35.29² =
  36. 36.29² =
  37. 37.61² =
  38. 38.51² =
  39. 39.49² =
  40. 40.41² =

Answer key

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

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