Are you looking for a math activity for missing addends to add to your December centers? These no-prep GOOGLE Slides can be a fun activity for practicing finding the missing addend. Students will practice using an addition equation or a part part whole model. Thirty slides with 2 different activities are included. Students will be working with addition sentences and the part part whole model looking for the missing addend. A number line is included at the bottom of each slide. The 2 engagin