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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 319 · 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. 1.39² =
  2. 2.61² =
  3. 3.81² =
  4. 4.81² =
  5. 5.41² =
  6. 6.49² =
  7. 7.21² =
  8. 8.59² =
  9. 9.91² =
  10. 10.39² =
  11. 11.51² =
  12. 12.41² =
  13. 13.31² =
  14. 14.79² =
  15. 15.29² =
  16. 16.39² =
  17. 17.21² =
  18. 18.51² =
  19. 19.89² =
  20. 20.89² =
  21. 21.29² =
  22. 22.31² =
  23. 23.31² =
  24. 24.19² =
  25. 25.29² =
  26. 26.69² =
  27. 27.91² =
  28. 28.19² =
  29. 29.39² =
  30. 30.21² =
  31. 31.61² =
  32. 32.29² =
  33. 33.31² =
  34. 34.69² =
  35. 35.19² =
  36. 36.81² =
  37. 37.89² =
  38. 38.91² =
  39. 39.29² =
  40. 40.49² =

Answer key

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

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