This center activity engages students in creating numbers by rolling different dice to create a sum and addend. The students are challenged to find the missing addend. This is a versatile activity that can be used with partners, small groups or individually. It can be easily differentiated by controlling the dice that are used and providing manipulatives. Students use higher order thinking skills in creating the numbers, placing the numbers and solving for the unknown. This will help get them ready for solving these types of word problems.