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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 571 · 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. 2.79² =
  3. 3.41² =
  4. 4.21² =
  5. 5.31² =
  6. 6.39² =
  7. 7.51² =
  8. 8.79² =
  9. 9.61² =
  10. 10.41² =
  11. 11.91² =
  12. 12.81² =
  13. 13.39² =
  14. 14.51² =
  15. 15.69² =
  16. 16.81² =
  17. 17.19² =
  18. 18.91² =
  19. 19.31² =
  20. 20.19² =
  21. 21.81² =
  22. 22.51² =
  23. 23.21² =
  24. 24.51² =
  25. 25.31² =
  26. 26.21² =
  27. 27.51² =
  28. 28.31² =
  29. 29.19² =
  30. 30.51² =
  31. 31.91² =
  32. 32.29² =
  33. 33.21² =
  34. 34.89² =
  35. 35.31² =
  36. 36.59² =
  37. 37.19² =
  38. 38.29² =
  39. 39.79² =
  40. 40.79² =

Answer key

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

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