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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 382 · 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. 1.39² =
  2. 2.21² =
  3. 3.19² =
  4. 4.79² =
  5. 5.29² =
  6. 6.79² =
  7. 7.19² =
  8. 8.29² =
  9. 9.19² =
  10. 10.59² =
  11. 11.21² =
  12. 12.21² =
  13. 13.51² =
  14. 14.49² =
  15. 15.31² =
  16. 16.59² =
  17. 17.89² =
  18. 18.29² =
  19. 19.91² =
  20. 20.91² =
  21. 21.39² =
  22. 22.39² =
  23. 23.69² =
  24. 24.89² =
  25. 25.39² =
  26. 26.81² =
  27. 27.19² =
  28. 28.19² =
  29. 29.69² =
  30. 30.69² =
  31. 31.31² =
  32. 32.41² =
  33. 33.19² =
  34. 34.31² =
  35. 35.51² =
  36. 36.29² =
  37. 37.49² =
  38. 38.21² =
  39. 39.21² =
  40. 40.41² =

Answer key

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

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