These platforms offer complete lessons, instructional videos, and adaptive practice for students.
Khan Academy: A widely used platform providing 100% free, standards-aligned instructional videos and practice exercises for grades 6–12.
DeltaMath: Features thousands of high-quality practice problems with step-by-step hints and immediate feedback for middle and high school math.
Illustrative Mathematics: Offers a free, open-resource (OER) problem-based curriculum for K–12 math with downloadable printable PDFs.
Dr. Frost Maths: Provides a vast library of free resources, including instructional PowerPoints, auto-marked questions, and assessment tools.