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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 762 · 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. 1.41² =
  2. 2.41² =
  3. 3.29² =
  4. 4.19² =
  5. 5.69² =
  6. 6.59² =
  7. 7.49² =
  8. 8.21² =
  9. 9.31² =
  10. 10.51² =
  11. 11.51² =
  12. 12.31² =
  13. 13.79² =
  14. 14.91² =
  15. 15.29² =
  16. 16.29² =
  17. 17.91² =
  18. 18.69² =
  19. 19.79² =
  20. 20.21² =
  21. 21.59² =
  22. 22.29² =
  23. 23.49² =
  24. 24.19² =
  25. 25.21² =
  26. 26.51² =
  27. 27.81² =
  28. 28.41² =
  29. 29.51² =
  30. 30.89² =
  31. 31.81² =
  32. 32.41² =
  33. 33.89² =
  34. 34.39² =
  35. 35.81² =
  36. 36.89² =
  37. 37.41² =
  38. 38.39² =
  39. 39.19² =
  40. 40.41² =

Answer key

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

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