I’ve made a set of 10 addition and subtraction mystery pictures (5 addition, 5 subtraction). They are a little hard for first graders unless they are more advanced (or maybe at the very end of the year). A lot of the problems students have to solve include doubles facts, doubles + or – 1, and adding or subtracting with 10′s. Since the answers are all numbers on a hundreds chart, you can imagine that some of the answers are pretty big numbers! You can find a preview on TeachersPayTeachers.