These PowerPoint slides help students learn how to decompose the number ten. Five sets of slides are included. They all serve the purpose, and are mostly similar, but the slides appear in a different order to help prevent kids from simply memorizing the answers. The presentation starts with slides with ten cubes split into two parts (addends), the first of which is uncovered and the second is covered (by a paper bag). When you click, the second part becomes uncovered, and an equation is revealed