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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 643 · 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. 1.29² =
  2. 2.49² =
  3. 3.51² =
  4. 4.39² =
  5. 5.21² =
  6. 6.21² =
  7. 7.21² =
  8. 8.21² =
  9. 9.29² =
  10. 10.21² =
  11. 11.49² =
  12. 12.41² =
  13. 13.29² =
  14. 14.21² =
  15. 15.41² =
  16. 16.81² =
  17. 17.81² =
  18. 18.69² =
  19. 19.39² =
  20. 20.71² =
  21. 21.31² =
  22. 22.19² =
  23. 23.31² =
  24. 24.91² =
  25. 25.41² =
  26. 26.19² =
  27. 27.89² =
  28. 28.79² =
  29. 29.51² =
  30. 30.59² =
  31. 31.81² =
  32. 32.39² =
  33. 33.89² =
  34. 34.39² =
  35. 35.31² =
  36. 36.89² =
  37. 37.51² =
  38. 38.39² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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