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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 554 · 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. 1.89² =
  2. 2.51² =
  3. 3.59² =
  4. 4.31² =
  5. 5.19² =
  6. 6.29² =
  7. 7.49² =
  8. 8.29² =
  9. 9.49² =
  10. 10.31² =
  11. 11.51² =
  12. 12.21² =
  13. 13.59² =
  14. 14.89² =
  15. 15.19² =
  16. 16.81² =
  17. 17.19² =
  18. 18.29² =
  19. 19.91² =
  20. 20.89² =
  21. 21.39² =
  22. 22.19² =
  23. 23.91² =
  24. 24.39² =
  25. 25.19² =
  26. 26.29² =
  27. 27.19² =
  28. 28.41² =
  29. 29.51² =
  30. 30.61² =
  31. 31.19² =
  32. 32.39² =
  33. 33.69² =
  34. 34.69² =
  35. 35.19² =
  36. 36.29² =
  37. 37.89² =
  38. 38.31² =
  39. 39.61² =
  40. 40.59² =

Answer key

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

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