1.Click the C in the bottom left corner to change the color.
2. Click a number (3) on the row (left).
3. Click a number (5) on the column (top).
4. Click the = sign (top right).
5. You will see the problem as a rectangle. All of it visualizes the structure of multiplication and its relation to the operation of addition showing that
3 x 5 equals 5 + 5 + 5.