Choose An Operation! This worksheet/activity has story problems in which the student must decide whether to add or subtract to solve the problem. This worksheet focuses on joining, separating and comparing problems. First, students will circle add or subtract and then write an equation to go with the story. There are appropriate numbers of pictures to match the stories in the beginning or the worksheet. As the problems continue only single pictures are available. The students may need to draw their own pictures or perhaps they will be able to solve the problem with only a number sentence.