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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 229 · 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. 1.79² =
  2. 2.31² =
  3. 3.39² =
  4. 4.39² =
  5. 5.69² =
  6. 6.21² =
  7. 7.31² =
  8. 8.49² =
  9. 9.39² =
  10. 10.19² =
  11. 11.89² =
  12. 12.79² =
  13. 13.21² =
  14. 14.61² =
  15. 15.39² =
  16. 16.91² =
  17. 17.91² =
  18. 18.59² =
  19. 19.31² =
  20. 20.79² =
  21. 21.31² =
  22. 22.21² =
  23. 23.19² =
  24. 24.19² =
  25. 25.29² =
  26. 26.21² =
  27. 27.61² =
  28. 28.51² =
  29. 29.51² =
  30. 30.41² =
  31. 31.89² =
  32. 32.19² =
  33. 33.29² =
  34. 34.39² =
  35. 35.39² =
  36. 36.69² =
  37. 37.21² =
  38. 38.31² =
  39. 39.89² =
  40. 40.51² =

Answer key

  1. 6241
  2. 961
  3. 1521
  4. 1521
  5. 4761
  6. 441
  7. 961
  8. 2401
  9. 1521
  10. 361
  11. 7921
  12. 6241
  13. 441
  14. 3721
  15. 1521
  16. 8281
  17. 8281
  18. 3481
  19. 961
  20. 6241
  21. 961
  22. 441
  23. 361
  24. 361
  25. 841
  26. 441
  27. 3721
  28. 2601
  29. 2601
  30. 1681
  31. 7921
  32. 361
  33. 841
  34. 1521
  35. 1521
  36. 4761
  37. 441
  38. 961
  39. 7921
  40. 2601

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