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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 666 · 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. 2.21² =
  3. 3.49² =
  4. 4.79² =
  5. 5.89² =
  6. 6.51² =
  7. 7.31² =
  8. 8.19² =
  9. 9.19² =
  10. 10.89² =
  11. 11.91² =
  12. 12.19² =
  13. 13.21² =
  14. 14.51² =
  15. 15.79² =
  16. 16.41² =
  17. 17.39² =
  18. 18.21² =
  19. 19.31² =
  20. 20.21² =
  21. 21.51² =
  22. 22.41² =
  23. 23.89² =
  24. 24.21² =
  25. 25.59² =
  26. 26.91² =
  27. 27.71² =
  28. 28.91² =
  29. 29.89² =
  30. 30.61² =
  31. 31.21² =
  32. 32.49² =
  33. 33.71² =
  34. 34.69² =
  35. 35.39² =
  36. 36.41² =
  37. 37.29² =
  38. 38.79² =
  39. 39.49² =
  40. 40.81² =

Answer key

  1. 1521
  2. 441
  3. 2401
  4. 6241
  5. 7921
  6. 2601
  7. 961
  8. 361
  9. 361
  10. 7921
  11. 8281
  12. 361
  13. 441
  14. 2601
  15. 6241
  16. 1681
  17. 1521
  18. 441
  19. 961
  20. 441
  21. 2601
  22. 1681
  23. 7921
  24. 441
  25. 3481
  26. 8281
  27. 5041
  28. 8281
  29. 7921
  30. 3721
  31. 441
  32. 2401
  33. 5041
  34. 4761
  35. 1521
  36. 1681
  37. 841
  38. 6241
  39. 2401
  40. 6561

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