This report presents results from the CPB-PBS Ready To Learn PEG+CAT Content Study. PEG+CAT is a unique transmedia property that emphasizes early mathematics and problem solving. Each episode is structured around a specific mathematical problem the characters are trying to solve together. It includes video episodes, interstitial video, online games, and a tablet-based app, that allows children and their families to engage with the same characters, settings, and narratives on multiple devices, across various physical and social settings. The study examined how a sample of 59 four-year-old children engaged with and learned from selected sets of PEG+CAT videos and interactive games over five less-than-hour-long interactions. These five independent, unmediated interactions took place in a controlled learning laboratory setting. (author abstract)