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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 315 · 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. 1.81² =
  2. 2.91² =
  3. 3.51² =
  4. 4.29² =
  5. 5.29² =
  6. 6.49² =
  7. 7.21² =
  8. 8.71² =
  9. 9.89² =
  10. 10.19² =
  11. 11.89² =
  12. 12.19² =
  13. 13.21² =
  14. 14.41² =
  15. 15.39² =
  16. 16.31² =
  17. 17.31² =
  18. 18.49² =
  19. 19.21² =
  20. 20.69² =
  21. 21.51² =
  22. 22.29² =
  23. 23.81² =
  24. 24.21² =
  25. 25.49² =
  26. 26.19² =
  27. 27.69² =
  28. 28.79² =
  29. 29.29² =
  30. 30.41² =
  31. 31.89² =
  32. 32.29² =
  33. 33.89² =
  34. 34.81² =
  35. 35.21² =
  36. 36.41² =
  37. 37.41² =
  38. 38.19² =
  39. 39.89² =
  40. 40.81² =

Answer key

  1. 6561
  2. 8281
  3. 2601
  4. 841
  5. 841
  6. 2401
  7. 441
  8. 5041
  9. 7921
  10. 361
  11. 7921
  12. 361
  13. 441
  14. 1681
  15. 1521
  16. 961
  17. 961
  18. 2401
  19. 441
  20. 4761
  21. 2601
  22. 841
  23. 6561
  24. 441
  25. 2401
  26. 361
  27. 4761
  28. 6241
  29. 841
  30. 1681
  31. 7921
  32. 841
  33. 7921
  34. 6561
  35. 441
  36. 1681
  37. 1681
  38. 361
  39. 7921
  40. 6561

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