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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 113 · 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. 1.59² =
  2. 2.31² =
  3. 3.19² =
  4. 4.59² =
  5. 5.41² =
  6. 6.29² =
  7. 7.71² =
  8. 8.81² =
  9. 9.69² =
  10. 10.59² =
  11. 11.81² =
  12. 12.71² =
  13. 13.79² =
  14. 14.81² =
  15. 15.41² =
  16. 16.31² =
  17. 17.89² =
  18. 18.29² =
  19. 19.29² =
  20. 20.89² =
  21. 21.51² =
  22. 22.91² =
  23. 23.41² =
  24. 24.61² =
  25. 25.41² =
  26. 26.41² =
  27. 27.21² =
  28. 28.41² =
  29. 29.31² =
  30. 30.91² =
  31. 31.39² =
  32. 32.19² =
  33. 33.29² =
  34. 34.29² =
  35. 35.39² =
  36. 36.89² =
  37. 37.39² =
  38. 38.59² =
  39. 39.41² =
  40. 40.49² =

Answer key

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

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