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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 674 · 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. 1.31² =
  2. 2.89² =
  3. 3.29² =
  4. 4.61² =
  5. 5.49² =
  6. 6.59² =
  7. 7.61² =
  8. 8.41² =
  9. 9.19² =
  10. 10.69² =
  11. 11.41² =
  12. 12.91² =
  13. 13.61² =
  14. 14.31² =
  15. 15.89² =
  16. 16.29² =
  17. 17.29² =
  18. 18.69² =
  19. 19.31² =
  20. 20.31² =
  21. 21.41² =
  22. 22.69² =
  23. 23.59² =
  24. 24.19² =
  25. 25.79² =
  26. 26.31² =
  27. 27.79² =
  28. 28.51² =
  29. 29.51² =
  30. 30.91² =
  31. 31.81² =
  32. 32.29² =
  33. 33.41² =
  34. 34.39² =
  35. 35.79² =
  36. 36.69² =
  37. 37.49² =
  38. 38.21² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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