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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 434 · 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. 1.91² =
  2. 2.91² =
  3. 3.81² =
  4. 4.89² =
  5. 5.19² =
  6. 6.31² =
  7. 7.61² =
  8. 8.89² =
  9. 9.51² =
  10. 10.51² =
  11. 11.81² =
  12. 12.39² =
  13. 13.49² =
  14. 14.39² =
  15. 15.41² =
  16. 16.41² =
  17. 17.79² =
  18. 18.51² =
  19. 19.59² =
  20. 20.31² =
  21. 21.49² =
  22. 22.31² =
  23. 23.29² =
  24. 24.41² =
  25. 25.21² =
  26. 26.39² =
  27. 27.69² =
  28. 28.21² =
  29. 29.61² =
  30. 30.69² =
  31. 31.19² =
  32. 32.89² =
  33. 33.51² =
  34. 34.61² =
  35. 35.49² =
  36. 36.21² =
  37. 37.21² =
  38. 38.29² =
  39. 39.49² =
  40. 40.69² =

Answer key

  1. 8281
  2. 8281
  3. 6561
  4. 7921
  5. 361
  6. 961
  7. 3721
  8. 7921
  9. 2601
  10. 2601
  11. 6561
  12. 1521
  13. 2401
  14. 1521
  15. 1681
  16. 1681
  17. 6241
  18. 2601
  19. 3481
  20. 961
  21. 2401
  22. 961
  23. 841
  24. 1681
  25. 441
  26. 1521
  27. 4761
  28. 441
  29. 3721
  30. 4761
  31. 361
  32. 7921
  33. 2601
  34. 3721
  35. 2401
  36. 441
  37. 441
  38. 841
  39. 2401
  40. 4761

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