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Knowledge base
More explainers from the knowledge base. Each one names what you need to know first, works through the method, and says where it usually goes wrong.
Method Pre-AlgebraHow to Solve a Proportion by Cross-MultiplyingA proportion says two ratios are equal. Cross-multiplying is not a trick — it is one multiplication applied to both sides.
Method Basic MathHow to Simplify a Square Root Step by Step√72 and 6√2 are the same number. The second is the finished answer, and getting there is a search for one thing: the largest square factor.
Method FractionsHow to Add Fractions With Different DenominatorsAdding fractions is only hard when the denominators differ. Once you know why they have to match, the method stops being a rule to memorise.
Method AlgebraHow to Factor a Trinomial: Step by StepFactoring a trinomial means finding the two binomials that multiply to give it. There is one method that always works, and one shortcut worth knowing.