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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 862 · 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. 2.41² =
  3. 3.29² =
  4. 4.89² =
  5. 5.91² =
  6. 6.51² =
  7. 7.29² =
  8. 8.69² =
  9. 9.29² =
  10. 10.39² =
  11. 11.31² =
  12. 12.69² =
  13. 13.81² =
  14. 14.21² =
  15. 15.19² =
  16. 16.31² =
  17. 17.91² =
  18. 18.69² =
  19. 19.61² =
  20. 20.59² =
  21. 21.51² =
  22. 22.71² =
  23. 23.59² =
  24. 24.71² =
  25. 25.31² =
  26. 26.51² =
  27. 27.81² =
  28. 28.49² =
  29. 29.19² =
  30. 30.79² =
  31. 31.31² =
  32. 32.29² =
  33. 33.19² =
  34. 34.31² =
  35. 35.91² =
  36. 36.59² =
  37. 37.39² =
  38. 38.51² =
  39. 39.19² =
  40. 40.49² =

Answer key

  1. 8281
  2. 1681
  3. 841
  4. 7921
  5. 8281
  6. 2601
  7. 841
  8. 4761
  9. 841
  10. 1521
  11. 961
  12. 4761
  13. 6561
  14. 441
  15. 361
  16. 961
  17. 8281
  18. 4761
  19. 3721
  20. 3481
  21. 2601
  22. 5041
  23. 3481
  24. 5041
  25. 961
  26. 2601
  27. 6561
  28. 2401
  29. 361
  30. 6241
  31. 961
  32. 841
  33. 361
  34. 961
  35. 8281
  36. 3481
  37. 1521
  38. 2601
  39. 361
  40. 2401

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