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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 405 · 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. 1.29² =
  2. 2.89² =
  3. 3.81² =
  4. 4.19² =
  5. 5.61² =
  6. 6.21² =
  7. 7.59² =
  8. 8.21² =
  9. 9.41² =
  10. 10.81² =
  11. 11.19² =
  12. 12.71² =
  13. 13.81² =
  14. 14.71² =
  15. 15.81² =
  16. 16.51² =
  17. 17.89² =
  18. 18.31² =
  19. 19.39² =
  20. 20.81² =
  21. 21.59² =
  22. 22.19² =
  23. 23.39² =
  24. 24.19² =
  25. 25.21² =
  26. 26.31² =
  27. 27.89² =
  28. 28.69² =
  29. 29.89² =
  30. 30.89² =
  31. 31.91² =
  32. 32.41² =
  33. 33.29² =
  34. 34.41² =
  35. 35.21² =
  36. 36.49² =
  37. 37.91² =
  38. 38.71² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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