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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 828 · 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. 1.71² =
  2. 2.31² =
  3. 3.79² =
  4. 4.89² =
  5. 5.39² =
  6. 6.39² =
  7. 7.59² =
  8. 8.41² =
  9. 9.71² =
  10. 10.21² =
  11. 11.31² =
  12. 12.31² =
  13. 13.19² =
  14. 14.19² =
  15. 15.79² =
  16. 16.29² =
  17. 17.59² =
  18. 18.49² =
  19. 19.69² =
  20. 20.89² =
  21. 21.39² =
  22. 22.29² =
  23. 23.19² =
  24. 24.91² =
  25. 25.69² =
  26. 26.21² =
  27. 27.49² =
  28. 28.91² =
  29. 29.49² =
  30. 30.59² =
  31. 31.29² =
  32. 32.29² =
  33. 33.91² =
  34. 34.89² =
  35. 35.51² =
  36. 36.49² =
  37. 37.81² =
  38. 38.91² =
  39. 39.39² =
  40. 40.49² =

Answer key

  1. 5041
  2. 961
  3. 6241
  4. 7921
  5. 1521
  6. 1521
  7. 3481
  8. 1681
  9. 5041
  10. 441
  11. 961
  12. 961
  13. 361
  14. 361
  15. 6241
  16. 841
  17. 3481
  18. 2401
  19. 4761
  20. 7921
  21. 1521
  22. 841
  23. 361
  24. 8281
  25. 4761
  26. 441
  27. 2401
  28. 8281
  29. 2401
  30. 3481
  31. 841
  32. 841
  33. 8281
  34. 7921
  35. 2601
  36. 2401
  37. 6561
  38. 8281
  39. 1521
  40. 2401

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