Doodles Do Algebra – Lesson 29


Update: This Lesson Is Part of Book 2 of Doodles Do Algebra: “Unknowns And The 29 Articles of Algebra” available on Amazon.


Teacher’s Notes:

This lesson, about roots, is the opposite of the lesson on power. DoodleCat explains pretty well. You can always take your child back to the idea that subtraction is the opposite of addition and that division is the opposite of multiplication and so roots are the opposite of powers in the same way.

Overall your child will practice calculating roots of constant, a – and then do the same root for a number. Doing this side by side hopefully causes your child to notice that there is a relationship and to begin to feel comfortable with square and cube roots. If He has trouble, especially with cube roots of larger numbers, coach him by asking what number multiplied by itself three times is 8? or 64? You can also refer your child to what he did on lesson 27, as the ‘forward’ answers to all of today’s problems are there. The goal here is for understanding, even if he needs coaching to get through it.


Available in the book, “Unknowns And The 29 Articles of Algebra, Book 2 of Doodles Do Algebra



  1. a, a^2, a^3
  2. 2, 4, 6
  3. a, a^2, a
  4. 3, 2, 4