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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 613 · 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. 2.91² =
  3. 3.41² =
  4. 4.41² =
  5. 5.61² =
  6. 6.29² =
  7. 7.51² =
  8. 8.29² =
  9. 9.29² =
  10. 10.71² =
  11. 11.59² =
  12. 12.29² =
  13. 13.81² =
  14. 14.39² =
  15. 15.59² =
  16. 16.69² =
  17. 17.39² =
  18. 18.19² =
  19. 19.89² =
  20. 20.71² =
  21. 21.49² =
  22. 22.19² =
  23. 23.41² =
  24. 24.89² =
  25. 25.69² =
  26. 26.49² =
  27. 27.31² =
  28. 28.49² =
  29. 29.31² =
  30. 30.61² =
  31. 31.71² =
  32. 32.89² =
  33. 33.21² =
  34. 34.19² =
  35. 35.71² =
  36. 36.29² =
  37. 37.21² =
  38. 38.51² =
  39. 39.59² =
  40. 40.49² =

Answer key

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

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