Wearing festive hats and scarves, snowmen are coming together — one, two, and more at a time! They're getting up to all sorts of wintertime activities, from snowball fights, to hide and seek, to skating on frozen ponds. As the rhyming text introduces the activities of each new group, an equation shows just how many snowmen there are on the page. Seven snowmen are snowshoeing next to eight fort-building snowmen, so readers discover that 7 + 8 = 15. The groupings of snowmen help readers see the different ways numbers can add up, and the charming illustrations and equations demonstrate a math trick that adds all the way up to 100.