# Doodles Do Algebra – Lesson 6

Update: This Lesson Is Part of Book 1 of Doodles Do Algebra: “Starting Out With Mental Algebra” available on Amazon.

Teacher’s Notes:

Today’s algebra lesson expands on the last 5 and adds a new complexity: figuring out quantities of two items when they are not the same but are related by some constant (like one being twice the other or one being three less than the other…)

This is where it becomes helpful to think in terms of x’s, but the problems can still be generally done in your (or your child’s head). For those of you who remember algebra class, this is the if you have two independent unknowns, you need two independent equations to solve for the unknowns” maxim at work. Last week all the problems were “one independent unknown with one independent equation” type, even if it didn’t always seem like it, since each problem collapsed down into one unknown even if we were talking about two people doing something. They were always equal distances away from each other, or an equal number of fruits were purchased, or the stick was broken in the middle. Today we look at how to solve the problems where things are not equally divided. It isn’t hard, as you might imagine, just different.

Worksheet:

Available in the book, “Starting Out With Mental Algebra, Book 1 of Doodles Do Algebra”