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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 517 · 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. 2.49² =
  3. 3.71² =
  4. 4.61² =
  5. 5.29² =
  6. 6.39² =
  7. 7.39² =
  8. 8.91² =
  9. 9.21² =
  10. 10.19² =
  11. 11.29² =
  12. 12.89² =
  13. 13.51² =
  14. 14.19² =
  15. 15.69² =
  16. 16.61² =
  17. 17.81² =
  18. 18.59² =
  19. 19.81² =
  20. 20.21² =
  21. 21.71² =
  22. 22.81² =
  23. 23.91² =
  24. 24.91² =
  25. 25.89² =
  26. 26.51² =
  27. 27.31² =
  28. 28.51² =
  29. 29.89² =
  30. 30.41² =
  31. 31.61² =
  32. 32.39² =
  33. 33.21² =
  34. 34.39² =
  35. 35.21² =
  36. 36.29² =
  37. 37.31² =
  38. 38.89² =
  39. 39.59² =
  40. 40.51² =

Answer key

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

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