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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 827 · 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. 1.81² =
  2. 2.61² =
  3. 3.41² =
  4. 4.69² =
  5. 5.41² =
  6. 6.59² =
  7. 7.41² =
  8. 8.51² =
  9. 9.59² =
  10. 10.31² =
  11. 11.81² =
  12. 12.59² =
  13. 13.41² =
  14. 14.19² =
  15. 15.39² =
  16. 16.69² =
  17. 17.21² =
  18. 18.29² =
  19. 19.41² =
  20. 20.19² =
  21. 21.21² =
  22. 22.59² =
  23. 23.29² =
  24. 24.91² =
  25. 25.29² =
  26. 26.91² =
  27. 27.31² =
  28. 28.29² =
  29. 29.21² =
  30. 30.79² =
  31. 31.29² =
  32. 32.69² =
  33. 33.59² =
  34. 34.91² =
  35. 35.79² =
  36. 36.79² =
  37. 37.19² =
  38. 38.21² =
  39. 39.59² =
  40. 40.21² =

Answer key

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

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