This task card set includes 26 task cards in which students are guided to use a number bond to help answer addition problems using the make twenty approach. A number bond is a mental picture of the relationship between a number and the parts that combine to make it. The concept of number bonds is very basic, an important foundation for understanding how numbers work. A whole thing is made up of parts. This activity would be a great follow-up to a number or strategy talk and would be perfect for a small group or a center!