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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 204 · 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. 2.21² =
  3. 3.81² =
  4. 4.69² =
  5. 5.61² =
  6. 6.79² =
  7. 7.19² =
  8. 8.21² =
  9. 9.91² =
  10. 10.79² =
  11. 11.49² =
  12. 12.29² =
  13. 13.51² =
  14. 14.69² =
  15. 15.41² =
  16. 16.31² =
  17. 17.51² =
  18. 18.41² =
  19. 19.89² =
  20. 20.39² =
  21. 21.69² =
  22. 22.59² =
  23. 23.71² =
  24. 24.21² =
  25. 25.51² =
  26. 26.61² =
  27. 27.51² =
  28. 28.61² =
  29. 29.91² =
  30. 30.81² =
  31. 31.39² =
  32. 32.21² =
  33. 33.19² =
  34. 34.89² =
  35. 35.29² =
  36. 36.39² =
  37. 37.29² =
  38. 38.31² =
  39. 39.91² =
  40. 40.29² =

Answer key

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

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