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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 208 · 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. 1.19² =
  2. 2.19² =
  3. 3.29² =
  4. 4.59² =
  5. 5.31² =
  6. 6.31² =
  7. 7.41² =
  8. 8.29² =
  9. 9.69² =
  10. 10.41² =
  11. 11.79² =
  12. 12.49² =
  13. 13.29² =
  14. 14.31² =
  15. 15.29² =
  16. 16.79² =
  17. 17.81² =
  18. 18.49² =
  19. 19.29² =
  20. 20.19² =
  21. 21.49² =
  22. 22.41² =
  23. 23.69² =
  24. 24.79² =
  25. 25.61² =
  26. 26.21² =
  27. 27.81² =
  28. 28.21² =
  29. 29.39² =
  30. 30.61² =
  31. 31.51² =
  32. 32.19² =
  33. 33.79² =
  34. 34.79² =
  35. 35.59² =
  36. 36.49² =
  37. 37.39² =
  38. 38.39² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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