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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 875 · 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. 1.71² =
  2. 2.29² =
  3. 3.89² =
  4. 4.59² =
  5. 5.51² =
  6. 6.19² =
  7. 7.39² =
  8. 8.39² =
  9. 9.69² =
  10. 10.19² =
  11. 11.19² =
  12. 12.41² =
  13. 13.29² =
  14. 14.31² =
  15. 15.29² =
  16. 16.89² =
  17. 17.41² =
  18. 18.61² =
  19. 19.71² =
  20. 20.69² =
  21. 21.31² =
  22. 22.41² =
  23. 23.31² =
  24. 24.21² =
  25. 25.19² =
  26. 26.51² =
  27. 27.61² =
  28. 28.61² =
  29. 29.21² =
  30. 30.19² =
  31. 31.29² =
  32. 32.89² =
  33. 33.49² =
  34. 34.21² =
  35. 35.41² =
  36. 36.29² =
  37. 37.51² =
  38. 38.19² =
  39. 39.89² =
  40. 40.51² =

Answer key

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

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