Math World

As math gets more advanced, students often need a reliable reference more than another worksheet, and MathWorld fits that role well. Hosted by Wolfram Research, this extensive online math encyclopedia offers concise explanations, definitions, and examples across a huge range of topics, from algebra and geometry through number theory and beyond. Created and curated by mathematician Eric Weisstein and contributors, it’s aimed at older teens and adults who can navigate formal notation. Parents and advanced learners appreciate having a free, reputable source to check terminology, formulas, or the background of a concept when textbooks are unclear. The interface is text-heavy and assumes comfort with symbols, so it isn’t appropriate for younger kids, but for high school and above it can be invaluable. Bookmark key pages relevant to current courses so students aren’t overwhelmed by the entire site.