Fractions
How to Add Fractions with Different Denominators
Learn why fractions need a common denominator, follow + step by step, and check your understanding with two practice problems.
Free Math Guides
Math makes more sense when each step has a reason. These short guides explain the idea, show how to use it, and help you spot a common mistake. Go at your own pace; you do not need to log in.
Try a Clear Explanation—No Account Needed
Start with one idea, follow a worked example, then try a problem yourself.
Algebra
How to Solve a Two-Step Linear Equation
Understand how to keep an equation balanced, solve 3x + 5 = 20 with clear what-and-why steps, and check your answer by substitution.
Graphing
Understanding Slope: Rise over Run with a Graph
See how slope measures a line’s steepness. Use a graph and two points to calculate rise over run, with negative, zero, and undefined slope explained.