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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 707 · 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. 1.39² =
  2. 2.31² =
  3. 3.49² =
  4. 4.79² =
  5. 5.41² =
  6. 6.41² =
  7. 7.31² =
  8. 8.39² =
  9. 9.91² =
  10. 10.29² =
  11. 11.79² =
  12. 12.51² =
  13. 13.69² =
  14. 14.29² =
  15. 15.19² =
  16. 16.21² =
  17. 17.31² =
  18. 18.49² =
  19. 19.61² =
  20. 20.91² =
  21. 21.81² =
  22. 22.49² =
  23. 23.89² =
  24. 24.69² =
  25. 25.39² =
  26. 26.61² =
  27. 27.31² =
  28. 28.91² =
  29. 29.59² =
  30. 30.29² =
  31. 31.89² =
  32. 32.59² =
  33. 33.49² =
  34. 34.91² =
  35. 35.29² =
  36. 36.81² =
  37. 37.51² =
  38. 38.31² =
  39. 39.21² =
  40. 40.89² =

Answer key

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

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