Review Excerpt: The app starts with six types of numerical representations, such as “Ten Frames” and “Rekenrek” models which are used in many school curriculums. Next, children can adjust the speed at which the images flash with a slider bar. There are four settings, or you can press a back or start button. This app helps the child devise strategies that help them see quantity in flexible ways and fosters development of number sense. Subscribers, please log into our database using your password to read the full review along with our rating.