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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 366 · 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. 1.29² =
  2. 2.29² =
  3. 3.39² =
  4. 4.29² =
  5. 5.39² =
  6. 6.21² =
  7. 7.79² =
  8. 8.31² =
  9. 9.79² =
  10. 10.59² =
  11. 11.31² =
  12. 12.29² =
  13. 13.71² =
  14. 14.49² =
  15. 15.91² =
  16. 16.79² =
  17. 17.61² =
  18. 18.49² =
  19. 19.79² =
  20. 20.31² =
  21. 21.41² =
  22. 22.89² =
  23. 23.39² =
  24. 24.31² =
  25. 25.59² =
  26. 26.21² =
  27. 27.49² =
  28. 28.41² =
  29. 29.49² =
  30. 30.71² =
  31. 31.21² =
  32. 32.49² =
  33. 33.29² =
  34. 34.89² =
  35. 35.59² =
  36. 36.21² =
  37. 37.19² =
  38. 38.61² =
  39. 39.41² =
  40. 40.49² =

Answer key

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

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