In math we've been working with addition. However, it's not enough to just be able to add two numbers. So, we've been taking some of our addition problems and writing stories to go along with them.
For example, if the problem is 4 + 3 = 7, the story might be:
There were four students at a table. Three more students sat down with them. Now there are seven students at the table.
Being able to create math stories requires a much deeper level of understanding than simply adding numbers.