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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 863 · 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. 2.59² =
  3. 3.21² =
  4. 4.79² =
  5. 5.79² =
  6. 6.41² =
  7. 7.89² =
  8. 8.29² =
  9. 9.29² =
  10. 10.21² =
  11. 11.39² =
  12. 12.21² =
  13. 13.31² =
  14. 14.89² =
  15. 15.31² =
  16. 16.69² =
  17. 17.41² =
  18. 18.29² =
  19. 19.29² =
  20. 20.19² =
  21. 21.19² =
  22. 22.21² =
  23. 23.51² =
  24. 24.89² =
  25. 25.71² =
  26. 26.21² =
  27. 27.61² =
  28. 28.59² =
  29. 29.69² =
  30. 30.79² =
  31. 31.69² =
  32. 32.19² =
  33. 33.39² =
  34. 34.39² =
  35. 35.39² =
  36. 36.19² =
  37. 37.59² =
  38. 38.31² =
  39. 39.41² =
  40. 40.49² =

Answer key

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

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