Pre-Algebra for Grades 5–7
Eight focused skills: equations, inequalities, function machines, expressions, substitution, and two-step reasoning.
Browse the skills
Each card opens a parent-readable explanation. Most also link straight to matching Numeris practice; a few link to the closest practice topic instead.
Solving One-Step Equations
An equation is a statement that two things are equal, with a letter standing in for an unknown number — like x + 5 = 12.
Practice / Learn →Solving Two-Step Equations
A two-step equation has two operations to undo, like 2x + 3 = 11.
Practice / Learn →Solving & Graphing Inequalities
An inequality compares two amounts that aren't necessarily equal, using <, >, ≤, or ≥.
Practice / Learn →Function Machines — Input/Output Rules
A function machine takes an input number, applies a rule, and gives an output — like a rule "multiply by 3, then add 1." Put in 2, get out 7.
Practice / Learn →Writing Algebraic Expressions
Algebra lets us write a phrase as math using a letter for an unknown.
Practice / Learn →Evaluating Expressions by Substitution
To evaluate an expression, replace each letter with its given value and then do the arithmetic, following the order of operations.
Practice / Learn →Inverse Operations — Working Backward
Every operation has an opposite that undoes it: addition ↔ subtraction, multiplication ↔ division.
Practice / Learn →Two-Step Reasoning with Unknowns
This pulls the pieces together: set up an equation from a situation, then solve it in two steps.
Practice / Learn →Jump into the interactive rooms.
Use the app for free practice, or open a specific skill from any page.
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