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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 813 · 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. 1.69² =
  2. 2.81² =
  3. 3.51² =
  4. 4.21² =
  5. 5.39² =
  6. 6.59² =
  7. 7.29² =
  8. 8.49² =
  9. 9.91² =
  10. 10.79² =
  11. 11.41² =
  12. 12.19² =
  13. 13.39² =
  14. 14.29² =
  15. 15.49² =
  16. 16.59² =
  17. 17.51² =
  18. 18.39² =
  19. 19.19² =
  20. 20.29² =
  21. 21.21² =
  22. 22.41² =
  23. 23.31² =
  24. 24.49² =
  25. 25.59² =
  26. 26.69² =
  27. 27.91² =
  28. 28.81² =
  29. 29.61² =
  30. 30.91² =
  31. 31.91² =
  32. 32.79² =
  33. 33.31² =
  34. 34.69² =
  35. 35.79² =
  36. 36.51² =
  37. 37.19² =
  38. 38.29² =
  39. 39.31² =
  40. 40.21² =

Answer key

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

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