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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 764 · 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. 1.51² =
  2. 2.29² =
  3. 3.71² =
  4. 4.31² =
  5. 5.19² =
  6. 6.81² =
  7. 7.71² =
  8. 8.31² =
  9. 9.39² =
  10. 10.19² =
  11. 11.51² =
  12. 12.71² =
  13. 13.89² =
  14. 14.39² =
  15. 15.79² =
  16. 16.91² =
  17. 17.61² =
  18. 18.91² =
  19. 19.91² =
  20. 20.89² =
  21. 21.69² =
  22. 22.71² =
  23. 23.21² =
  24. 24.19² =
  25. 25.71² =
  26. 26.29² =
  27. 27.29² =
  28. 28.19² =
  29. 29.81² =
  30. 30.49² =
  31. 31.59² =
  32. 32.29² =
  33. 33.31² =
  34. 34.71² =
  35. 35.31² =
  36. 36.19² =
  37. 37.31² =
  38. 38.51² =
  39. 39.29² =
  40. 40.39² =

Answer key

  1. 2601
  2. 841
  3. 5041
  4. 961
  5. 361
  6. 6561
  7. 5041
  8. 961
  9. 1521
  10. 361
  11. 2601
  12. 5041
  13. 7921
  14. 1521
  15. 6241
  16. 8281
  17. 3721
  18. 8281
  19. 8281
  20. 7921
  21. 4761
  22. 5041
  23. 441
  24. 361
  25. 5041
  26. 841
  27. 841
  28. 361
  29. 6561
  30. 2401
  31. 3481
  32. 841
  33. 961
  34. 5041
  35. 961
  36. 361
  37. 961
  38. 2601
  39. 841
  40. 1521

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