As mathematics instructors know, powerful visuals and engaging problems are key to teaching students new numeracy skills and concepts. TED-Ed, the youth and education initiative tied to the popular lecture series, is home to a number of short videos related to mathematics. Created by a team of educators, content experts (including TED speakers), animators, and video directors, this collection includes short, instructional films about key math vocabulary and concepts as well as a series of mathematical riddles (these would make strong classroom warm-up or team building activities). Instructors can search for videos by category (Algebra, Geometry, and Number Operations) or browse for materials by Student Level. One recent instruction short, for example, helps students understand the concept of a vector. Another explains "why the metric system matters." Each video is accompanied by a series of multiple choice quizzes (in the Think section) and information about related concepts and resources (in the Dig Deeper section).