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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 132 · 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. 1.59² =
  2. 2.49² =
  3. 3.31² =
  4. 4.21² =
  5. 5.59² =
  6. 6.69² =
  7. 7.89² =
  8. 8.91² =
  9. 9.29² =
  10. 10.31² =
  11. 11.19² =
  12. 12.19² =
  13. 13.69² =
  14. 14.29² =
  15. 15.41² =
  16. 16.21² =
  17. 17.31² =
  18. 18.31² =
  19. 19.51² =
  20. 20.81² =
  21. 21.41² =
  22. 22.31² =
  23. 23.21² =
  24. 24.39² =
  25. 25.19² =
  26. 26.89² =
  27. 27.89² =
  28. 28.39² =
  29. 29.39² =
  30. 30.61² =
  31. 31.59² =
  32. 32.91² =
  33. 33.59² =
  34. 34.39² =
  35. 35.29² =
  36. 36.69² =
  37. 37.21² =
  38. 38.21² =
  39. 39.91² =
  40. 40.59² =

Answer key

  1. 3481
  2. 2401
  3. 961
  4. 441
  5. 3481
  6. 4761
  7. 7921
  8. 8281
  9. 841
  10. 961
  11. 361
  12. 361
  13. 4761
  14. 841
  15. 1681
  16. 441
  17. 961
  18. 961
  19. 2601
  20. 6561
  21. 1681
  22. 961
  23. 441
  24. 1521
  25. 361
  26. 7921
  27. 7921
  28. 1521
  29. 1521
  30. 3721
  31. 3481
  32. 8281
  33. 3481
  34. 1521
  35. 841
  36. 4761
  37. 441
  38. 441
  39. 8281
  40. 3481

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