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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 361 · 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. 1.19² =
  2. 2.49² =
  3. 3.31² =
  4. 4.29² =
  5. 5.89² =
  6. 6.21² =
  7. 7.21² =
  8. 8.29² =
  9. 9.69² =
  10. 10.39² =
  11. 11.51² =
  12. 12.79² =
  13. 13.89² =
  14. 14.21² =
  15. 15.69² =
  16. 16.59² =
  17. 17.39² =
  18. 18.31² =
  19. 19.69² =
  20. 20.39² =
  21. 21.29² =
  22. 22.21² =
  23. 23.21² =
  24. 24.39² =
  25. 25.31² =
  26. 26.59² =
  27. 27.21² =
  28. 28.41² =
  29. 29.91² =
  30. 30.49² =
  31. 31.39² =
  32. 32.51² =
  33. 33.51² =
  34. 34.41² =
  35. 35.29² =
  36. 36.89² =
  37. 37.61² =
  38. 38.49² =
  39. 39.91² =
  40. 40.39² =

Answer key

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

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