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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 857 · 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. 2.61² =
  3. 3.21² =
  4. 4.89² =
  5. 5.41² =
  6. 6.69² =
  7. 7.71² =
  8. 8.49² =
  9. 9.81² =
  10. 10.19² =
  11. 11.69² =
  12. 12.19² =
  13. 13.39² =
  14. 14.51² =
  15. 15.91² =
  16. 16.19² =
  17. 17.41² =
  18. 18.29² =
  19. 19.21² =
  20. 20.91² =
  21. 21.21² =
  22. 22.39² =
  23. 23.61² =
  24. 24.49² =
  25. 25.69² =
  26. 26.29² =
  27. 27.29² =
  28. 28.69² =
  29. 29.61² =
  30. 30.31² =
  31. 31.89² =
  32. 32.49² =
  33. 33.31² =
  34. 34.59² =
  35. 35.31² =
  36. 36.31² =
  37. 37.89² =
  38. 38.89² =
  39. 39.51² =
  40. 40.31² =

Answer key

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

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