Some brands offer smaller digital frames, but the most common screen size is around nine or ten inches, and the largest go up to 21 inches. For screen resolution, look for 720p or higher ...

You can add the number to itself to get a double ... So you need an extra ten frame. Slide 1 of 9, Two single blocks with the text "1 + 1 = 2" below. On the right, two blocks are stacked on ...