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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 228 · 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. 1.91² =
  2. 2.51² =
  3. 3.69² =
  4. 4.91² =
  5. 5.51² =
  6. 6.89² =
  7. 7.41² =
  8. 8.31² =
  9. 9.41² =
  10. 10.19² =
  11. 11.79² =
  12. 12.39² =
  13. 13.51² =
  14. 14.61² =
  15. 15.79² =
  16. 16.81² =
  17. 17.89² =
  18. 18.21² =
  19. 19.29² =
  20. 20.81² =
  21. 21.49² =
  22. 22.61² =
  23. 23.91² =
  24. 24.21² =
  25. 25.69² =
  26. 26.69² =
  27. 27.79² =
  28. 28.59² =
  29. 29.41² =
  30. 30.29² =
  31. 31.61² =
  32. 32.51² =
  33. 33.39² =
  34. 34.29² =
  35. 35.91² =
  36. 36.61² =
  37. 37.81² =
  38. 38.89² =
  39. 39.51² =
  40. 40.49² =

Answer key

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

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