Delta Math

Once kids hit algebra and beyond, finding enough quality practice problems with immediate feedback becomes a real pain point. DeltaMath is an online platform where teachers (and savvy parents) assign problem sets in algebra, geometry, and higher math, with instant grading and worked solutions. Created by a high school math teacher, it was originally built to streamline practice and has grown into a deep bank of exercises. We love that students can retry problems and see step‑by‑step explanations, which makes it great for review and test prep. It’s ideal for middle and high schoolers who already had instruction and now need systematic practice. The interface is more functional than pretty, and setup is easiest if you’re comfortable thinking like a “teacher,” but the content is excellent and often free. Pro tip: have your teen keep a list of problems they missed and copy one or two into a notebook to re‑work by hand later.