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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 221 · 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. 1.89² =
  2. 2.31² =
  3. 3.21² =
  4. 4.19² =
  5. 5.59² =
  6. 6.89² =
  7. 7.51² =
  8. 8.61² =
  9. 9.41² =
  10. 10.79² =
  11. 11.69² =
  12. 12.41² =
  13. 13.61² =
  14. 14.59² =
  15. 15.91² =
  16. 16.51² =
  17. 17.39² =
  18. 18.21² =
  19. 19.81² =
  20. 20.41² =
  21. 21.29² =
  22. 22.19² =
  23. 23.51² =
  24. 24.49² =
  25. 25.29² =
  26. 26.29² =
  27. 27.89² =
  28. 28.49² =
  29. 29.89² =
  30. 30.89² =
  31. 31.69² =
  32. 32.31² =
  33. 33.31² =
  34. 34.19² =
  35. 35.51² =
  36. 36.89² =
  37. 37.39² =
  38. 38.81² =
  39. 39.81² =
  40. 40.21² =

Answer key

  1. 7921
  2. 961
  3. 441
  4. 361
  5. 3481
  6. 7921
  7. 2601
  8. 3721
  9. 1681
  10. 6241
  11. 4761
  12. 1681
  13. 3721
  14. 3481
  15. 8281
  16. 2601
  17. 1521
  18. 441
  19. 6561
  20. 1681
  21. 841
  22. 361
  23. 2601
  24. 2401
  25. 841
  26. 841
  27. 7921
  28. 2401
  29. 7921
  30. 7921
  31. 4761
  32. 961
  33. 961
  34. 361
  35. 2601
  36. 7921
  37. 1521
  38. 6561
  39. 6561
  40. 441

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