Use lessons your way

Every fraction diagram includes a text description of its whole, partitions and shading. Models do not depend on color alone. Printable PDFs use selectable text and vector diagrams.

Keyboard controls

Use Tab to move between controls. In material preview tabs, use left and right arrows to change tabs. In presentation mode, use left and right arrows to change slides and Space to reveal or hide an answer. Practice accepts Enter to check an answer.

Printing

Choose Letter or A4 PDF files from the lesson page. The printable HTML route works with your browser’s “Print / Save as PDF” command and hides controls on paper.

Known limits

The PDF files are not fully tagged for screen readers. Use the HTML lesson and its diagram text descriptions for accessible reading. Browser zoom, keyboard operation and mobile layouts are supported; no independent accessibility certification has been performed.