The document contains a review of math chapter 1 concepts including:
1) Expressions are written to represent word problems such as the number of baseball players on a bench.
2) Properties of addition and equations are solved using properties like commutative, associative, identity, and grouping.
3) Rules are found from patterns in tables and used to write and solve equations for missing numbers.
4) Equations are balanced by determining the equivalent value of coins on both sides of the equal sign.