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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 263 · 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. 2.31² =
  3. 3.29² =
  4. 4.19² =
  5. 5.39² =
  6. 6.51² =
  7. 7.31² =
  8. 8.29² =
  9. 9.19² =
  10. 10.41² =
  11. 11.19² =
  12. 12.29² =
  13. 13.71² =
  14. 14.91² =
  15. 15.71² =
  16. 16.71² =
  17. 17.89² =
  18. 18.51² =
  19. 19.19² =
  20. 20.19² =
  21. 21.41² =
  22. 22.51² =
  23. 23.51² =
  24. 24.81² =
  25. 25.89² =
  26. 26.79² =
  27. 27.81² =
  28. 28.31² =
  29. 29.39² =
  30. 30.39² =
  31. 31.89² =
  32. 32.39² =
  33. 33.51² =
  34. 34.31² =
  35. 35.49² =
  36. 36.19² =
  37. 37.41² =
  38. 38.41² =
  39. 39.31² =
  40. 40.71² =

Answer key

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

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