This 29 NO PREP, SELF-CHECKING boom decks will let 5th grade, 6th grade, and middle school math students practice: 1. AlgebraUsing letters to represent unknown numbers.Simplifying algebraic expressions (e.g., $x + x = 2x$).Evaluation of expressions by substitution.Solving word problems using simple algebraic equations.2. Ratio (New to P6)Expressing relationships between quantities as ratios.Finding equivalent ratios and simplifying them.Solving multi-step word problems.3. Average (New to P6)Und