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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 525 · 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. 2.19² =
  3. 3.29² =
  4. 4.51² =
  5. 5.51² =
  6. 6.59² =
  7. 7.61² =
  8. 8.49² =
  9. 9.81² =
  10. 10.49² =
  11. 11.21² =
  12. 12.59² =
  13. 13.29² =
  14. 14.41² =
  15. 15.49² =
  16. 16.59² =
  17. 17.71² =
  18. 18.49² =
  19. 19.19² =
  20. 20.41² =
  21. 21.31² =
  22. 22.29² =
  23. 23.81² =
  24. 24.21² =
  25. 25.19² =
  26. 26.31² =
  27. 27.81² =
  28. 28.81² =
  29. 29.21² =
  30. 30.91² =
  31. 31.89² =
  32. 32.61² =
  33. 33.91² =
  34. 34.79² =
  35. 35.21² =
  36. 36.71² =
  37. 37.31² =
  38. 38.81² =
  39. 39.49² =
  40. 40.81² =

Answer key

  1. 8281
  2. 361
  3. 841
  4. 2601
  5. 2601
  6. 3481
  7. 3721
  8. 2401
  9. 6561
  10. 2401
  11. 441
  12. 3481
  13. 841
  14. 1681
  15. 2401
  16. 3481
  17. 5041
  18. 2401
  19. 361
  20. 1681
  21. 961
  22. 841
  23. 6561
  24. 441
  25. 361
  26. 961
  27. 6561
  28. 6561
  29. 441
  30. 8281
  31. 7921
  32. 3721
  33. 8281
  34. 6241
  35. 441
  36. 5041
  37. 961
  38. 6561
  39. 2401
  40. 6561

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