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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 737 · 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. 2.89² =
  3. 3.89² =
  4. 4.69² =
  5. 5.31² =
  6. 6.29² =
  7. 7.19² =
  8. 8.41² =
  9. 9.39² =
  10. 10.19² =
  11. 11.29² =
  12. 12.91² =
  13. 13.69² =
  14. 14.69² =
  15. 15.59² =
  16. 16.21² =
  17. 17.51² =
  18. 18.91² =
  19. 19.39² =
  20. 20.89² =
  21. 21.71² =
  22. 22.89² =
  23. 23.91² =
  24. 24.31² =
  25. 25.21² =
  26. 26.51² =
  27. 27.41² =
  28. 28.69² =
  29. 29.29² =
  30. 30.19² =
  31. 31.39² =
  32. 32.81² =
  33. 33.31² =
  34. 34.29² =
  35. 35.91² =
  36. 36.91² =
  37. 37.91² =
  38. 38.59² =
  39. 39.31² =
  40. 40.69² =

Answer key

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

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