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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 869 · 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. 1.31² =
  2. 2.59² =
  3. 3.79² =
  4. 4.21² =
  5. 5.91² =
  6. 6.81² =
  7. 7.59² =
  8. 8.69² =
  9. 9.61² =
  10. 10.31² =
  11. 11.69² =
  12. 12.59² =
  13. 13.79² =
  14. 14.29² =
  15. 15.81² =
  16. 16.31² =
  17. 17.79² =
  18. 18.51² =
  19. 19.31² =
  20. 20.19² =
  21. 21.51² =
  22. 22.61² =
  23. 23.59² =
  24. 24.41² =
  25. 25.29² =
  26. 26.41² =
  27. 27.81² =
  28. 28.21² =
  29. 29.39² =
  30. 30.29² =
  31. 31.59² =
  32. 32.19² =
  33. 33.79² =
  34. 34.19² =
  35. 35.91² =
  36. 36.39² =
  37. 37.49² =
  38. 38.59² =
  39. 39.21² =
  40. 40.39² =

Answer key

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

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