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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 11 · 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. 1.19² =
  2. 2.79² =
  3. 3.91² =
  4. 4.49² =
  5. 5.39² =
  6. 6.79² =
  7. 7.51² =
  8. 8.21² =
  9. 9.89² =
  10. 10.21² =
  11. 11.31² =
  12. 12.49² =
  13. 13.21² =
  14. 14.41² =
  15. 15.39² =
  16. 16.19² =
  17. 17.41² =
  18. 18.49² =
  19. 19.69² =
  20. 20.31² =
  21. 21.61² =
  22. 22.59² =
  23. 23.69² =
  24. 24.51² =
  25. 25.61² =
  26. 26.81² =
  27. 27.39² =
  28. 28.69² =
  29. 29.51² =
  30. 30.59² =
  31. 31.91² =
  32. 32.61² =
  33. 33.29² =
  34. 34.61² =
  35. 35.19² =
  36. 36.61² =
  37. 37.89² =
  38. 38.69² =
  39. 39.49² =
  40. 40.49² =

Answer key

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

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