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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 227 · 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. 2.61² =
  3. 3.71² =
  4. 4.19² =
  5. 5.79² =
  6. 6.69² =
  7. 7.61² =
  8. 8.71² =
  9. 9.21² =
  10. 10.49² =
  11. 11.59² =
  12. 12.89² =
  13. 13.41² =
  14. 14.29² =
  15. 15.21² =
  16. 16.29² =
  17. 17.49² =
  18. 18.51² =
  19. 19.41² =
  20. 20.71² =
  21. 21.19² =
  22. 22.51² =
  23. 23.71² =
  24. 24.21² =
  25. 25.21² =
  26. 26.81² =
  27. 27.31² =
  28. 28.61² =
  29. 29.19² =
  30. 30.69² =
  31. 31.59² =
  32. 32.69² =
  33. 33.49² =
  34. 34.21² =
  35. 35.89² =
  36. 36.31² =
  37. 37.59² =
  38. 38.29² =
  39. 39.21² =
  40. 40.19² =

Answer key

  1. 361
  2. 3721
  3. 5041
  4. 361
  5. 6241
  6. 4761
  7. 3721
  8. 5041
  9. 441
  10. 2401
  11. 3481
  12. 7921
  13. 1681
  14. 841
  15. 441
  16. 841
  17. 2401
  18. 2601
  19. 1681
  20. 5041
  21. 361
  22. 2601
  23. 5041
  24. 441
  25. 441
  26. 6561
  27. 961
  28. 3721
  29. 361
  30. 4761
  31. 3481
  32. 4761
  33. 2401
  34. 441
  35. 7921
  36. 961
  37. 3481
  38. 841
  39. 441
  40. 361

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