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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 86 · 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. 2.41² =
  3. 3.59² =
  4. 4.41² =
  5. 5.61² =
  6. 6.39² =
  7. 7.21² =
  8. 8.41² =
  9. 9.41² =
  10. 10.91² =
  11. 11.91² =
  12. 12.31² =
  13. 13.79² =
  14. 14.81² =
  15. 15.89² =
  16. 16.81² =
  17. 17.69² =
  18. 18.41² =
  19. 19.71² =
  20. 20.79² =
  21. 21.41² =
  22. 22.51² =
  23. 23.39² =
  24. 24.51² =
  25. 25.29² =
  26. 26.21² =
  27. 27.29² =
  28. 28.31² =
  29. 29.31² =
  30. 30.69² =
  31. 31.41² =
  32. 32.51² =
  33. 33.29² =
  34. 34.61² =
  35. 35.89² =
  36. 36.89² =
  37. 37.21² =
  38. 38.71² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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