Comparing+Quantities

This unit introduces the students to several informal models that are used to solve systems of equations. By the end of the book, they use more formal representations to solve the same scenarios introduced in the earlier sections.
 * __Overview__**: Comparing Quantities


 * __Sec A__**: Introduces the student to the idea of "fair trade" through several contexts where they replace quantities of one item for quantities of another item of equal value to solve problems.
 * __Sec B__**: Students are introduced to "combination charts" as a model for determining price combinations of two items. Patterns of price combinations become a focus in the latter part of the unit-again with the focus of a "fair trade".
 * __Sec C__**: In this section the students learn to solve problems involving two variables where the exchange between the items is not equal.
 * __Sec D__**: In this section students are introduced to "menu notation" as a means for solving problems with three unknown quantities.
 * __Sec E__**: In this section, the students revisit the prior scenarios with a focus on more formal algebraic notation.

Links: [|Algebraic reasoning] activity Algebraic thinking [|game]