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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 175 · 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. 1.89² =
  2. 2.41² =
  3. 3.59² =
  4. 4.29² =
  5. 5.79² =
  6. 6.91² =
  7. 7.89² =
  8. 8.51² =
  9. 9.41² =
  10. 10.59² =
  11. 11.91² =
  12. 12.21² =
  13. 13.29² =
  14. 14.29² =
  15. 15.61² =
  16. 16.51² =
  17. 17.31² =
  18. 18.21² =
  19. 19.49² =
  20. 20.69² =
  21. 21.41² =
  22. 22.21² =
  23. 23.79² =
  24. 24.21² =
  25. 25.39² =
  26. 26.51² =
  27. 27.61² =
  28. 28.21² =
  29. 29.91² =
  30. 30.91² =
  31. 31.61² =
  32. 32.29² =
  33. 33.79² =
  34. 34.19² =
  35. 35.89² =
  36. 36.21² =
  37. 37.59² =
  38. 38.31² =
  39. 39.49² =
  40. 40.39² =

Answer key

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

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