This product is a set of 10 different 4 x 4 bingo boards. The problems are a focus on addition doubles and close to doubles. For example, it will focus on 1+1, 2+2, 3+3, and so on up until 10. Then it has a few "close to doubles" like: 4+5, 3+4, and 8+7. The goal is to help kids practice their doubles and use that to quickly determine the answer to a problem one off from a double.