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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 478 · 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. 1.51² =
  2. 2.71² =
  3. 3.51² =
  4. 4.31² =
  5. 5.91² =
  6. 6.61² =
  7. 7.39² =
  8. 8.31² =
  9. 9.51² =
  10. 10.19² =
  11. 11.91² =
  12. 12.61² =
  13. 13.19² =
  14. 14.31² =
  15. 15.61² =
  16. 16.21² =
  17. 17.21² =
  18. 18.71² =
  19. 19.79² =
  20. 20.31² =
  21. 21.29² =
  22. 22.49² =
  23. 23.21² =
  24. 24.19² =
  25. 25.89² =
  26. 26.31² =
  27. 27.51² =
  28. 28.29² =
  29. 29.21² =
  30. 30.31² =
  31. 31.29² =
  32. 32.81² =
  33. 33.29² =
  34. 34.69² =
  35. 35.21² =
  36. 36.31² =
  37. 37.51² =
  38. 38.89² =
  39. 39.31² =
  40. 40.69² =

Answer key

  1. 2601
  2. 5041
  3. 2601
  4. 961
  5. 8281
  6. 3721
  7. 1521
  8. 961
  9. 2601
  10. 361
  11. 8281
  12. 3721
  13. 361
  14. 961
  15. 3721
  16. 441
  17. 441
  18. 5041
  19. 6241
  20. 961
  21. 841
  22. 2401
  23. 441
  24. 361
  25. 7921
  26. 961
  27. 2601
  28. 841
  29. 441
  30. 961
  31. 841
  32. 6561
  33. 841
  34. 4761
  35. 441
  36. 961
  37. 2601
  38. 7921
  39. 961
  40. 4761

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