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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 136 · 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. 2.39² =
  3. 3.31² =
  4. 4.91² =
  5. 5.91² =
  6. 6.81² =
  7. 7.21² =
  8. 8.91² =
  9. 9.41² =
  10. 10.89² =
  11. 11.29² =
  12. 12.19² =
  13. 13.69² =
  14. 14.21² =
  15. 15.51² =
  16. 16.51² =
  17. 17.51² =
  18. 18.31² =
  19. 19.41² =
  20. 20.71² =
  21. 21.91² =
  22. 22.61² =
  23. 23.91² =
  24. 24.29² =
  25. 25.19² =
  26. 26.31² =
  27. 27.39² =
  28. 28.69² =
  29. 29.31² =
  30. 30.21² =
  31. 31.61² =
  32. 32.21² =
  33. 33.51² =
  34. 34.31² =
  35. 35.59² =
  36. 36.29² =
  37. 37.19² =
  38. 38.69² =
  39. 39.29² =
  40. 40.89² =

Answer key

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

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