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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 825 · 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. 2.21² =
  3. 3.79² =
  4. 4.69² =
  5. 5.31² =
  6. 6.49² =
  7. 7.19² =
  8. 8.71² =
  9. 9.59² =
  10. 10.51² =
  11. 11.49² =
  12. 12.51² =
  13. 13.21² =
  14. 14.69² =
  15. 15.19² =
  16. 16.21² =
  17. 17.81² =
  18. 18.29² =
  19. 19.49² =
  20. 20.41² =
  21. 21.31² =
  22. 22.71² =
  23. 23.59² =
  24. 24.39² =
  25. 25.89² =
  26. 26.29² =
  27. 27.51² =
  28. 28.59² =
  29. 29.49² =
  30. 30.91² =
  31. 31.71² =
  32. 32.51² =
  33. 33.21² =
  34. 34.69² =
  35. 35.69² =
  36. 36.21² =
  37. 37.91² =
  38. 38.39² =
  39. 39.21² =
  40. 40.29² =

Answer key

  1. 961
  2. 441
  3. 6241
  4. 4761
  5. 961
  6. 2401
  7. 361
  8. 5041
  9. 3481
  10. 2601
  11. 2401
  12. 2601
  13. 441
  14. 4761
  15. 361
  16. 441
  17. 6561
  18. 841
  19. 2401
  20. 1681
  21. 961
  22. 5041
  23. 3481
  24. 1521
  25. 7921
  26. 841
  27. 2601
  28. 3481
  29. 2401
  30. 8281
  31. 5041
  32. 2601
  33. 441
  34. 4761
  35. 4761
  36. 441
  37. 8281
  38. 1521
  39. 441
  40. 841

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