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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 281 · 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. 1.21² =
  2. 2.61² =
  3. 3.31² =
  4. 4.59² =
  5. 5.41² =
  6. 6.51² =
  7. 7.89² =
  8. 8.89² =
  9. 9.49² =
  10. 10.59² =
  11. 11.41² =
  12. 12.19² =
  13. 13.81² =
  14. 14.51² =
  15. 15.31² =
  16. 16.41² =
  17. 17.51² =
  18. 18.19² =
  19. 19.51² =
  20. 20.29² =
  21. 21.19² =
  22. 22.31² =
  23. 23.51² =
  24. 24.29² =
  25. 25.49² =
  26. 26.69² =
  27. 27.71² =
  28. 28.91² =
  29. 29.19² =
  30. 30.51² =
  31. 31.69² =
  32. 32.31² =
  33. 33.39² =
  34. 34.61² =
  35. 35.59² =
  36. 36.31² =
  37. 37.89² =
  38. 38.81² =
  39. 39.51² =
  40. 40.71² =

Answer key

  1. 441
  2. 3721
  3. 961
  4. 3481
  5. 1681
  6. 2601
  7. 7921
  8. 7921
  9. 2401
  10. 3481
  11. 1681
  12. 361
  13. 6561
  14. 2601
  15. 961
  16. 1681
  17. 2601
  18. 361
  19. 2601
  20. 841
  21. 361
  22. 961
  23. 2601
  24. 841
  25. 2401
  26. 4761
  27. 5041
  28. 8281
  29. 361
  30. 2601
  31. 4761
  32. 961
  33. 1521
  34. 3721
  35. 3481
  36. 961
  37. 7921
  38. 6561
  39. 2601
  40. 5041

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