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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 398 · 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. 2.41² =
  3. 3.69² =
  4. 4.51² =
  5. 5.41² =
  6. 6.21² =
  7. 7.31² =
  8. 8.39² =
  9. 9.19² =
  10. 10.59² =
  11. 11.31² =
  12. 12.19² =
  13. 13.81² =
  14. 14.29² =
  15. 15.81² =
  16. 16.81² =
  17. 17.21² =
  18. 18.61² =
  19. 19.39² =
  20. 20.41² =
  21. 21.91² =
  22. 22.31² =
  23. 23.41² =
  24. 24.91² =
  25. 25.41² =
  26. 26.29² =
  27. 27.39² =
  28. 28.19² =
  29. 29.59² =
  30. 30.31² =
  31. 31.39² =
  32. 32.61² =
  33. 33.59² =
  34. 34.21² =
  35. 35.59² =
  36. 36.31² =
  37. 37.19² =
  38. 38.89² =
  39. 39.31² =
  40. 40.71² =

Answer key

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

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