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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 766 · 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. 1.41² =
  2. 2.61² =
  3. 3.31² =
  4. 4.81² =
  5. 5.19² =
  6. 6.19² =
  7. 7.79² =
  8. 8.41² =
  9. 9.89² =
  10. 10.19² =
  11. 11.29² =
  12. 12.19² =
  13. 13.39² =
  14. 14.29² =
  15. 15.31² =
  16. 16.61² =
  17. 17.69² =
  18. 18.59² =
  19. 19.49² =
  20. 20.39² =
  21. 21.71² =
  22. 22.91² =
  23. 23.51² =
  24. 24.69² =
  25. 25.31² =
  26. 26.31² =
  27. 27.69² =
  28. 28.71² =
  29. 29.19² =
  30. 30.89² =
  31. 31.21² =
  32. 32.39² =
  33. 33.31² =
  34. 34.19² =
  35. 35.79² =
  36. 36.59² =
  37. 37.39² =
  38. 38.41² =
  39. 39.31² =
  40. 40.49² =

Answer key

  1. 1681
  2. 3721
  3. 961
  4. 6561
  5. 361
  6. 361
  7. 6241
  8. 1681
  9. 7921
  10. 361
  11. 841
  12. 361
  13. 1521
  14. 841
  15. 961
  16. 3721
  17. 4761
  18. 3481
  19. 2401
  20. 1521
  21. 5041
  22. 8281
  23. 2601
  24. 4761
  25. 961
  26. 961
  27. 4761
  28. 5041
  29. 361
  30. 7921
  31. 441
  32. 1521
  33. 961
  34. 361
  35. 6241
  36. 3481
  37. 1521
  38. 1681
  39. 961
  40. 2401

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