This is an addition/subtraction practice group game! It is a fun way for students to practice solving problems by showing and checking their work. The students will each be assigned a problem, solve it, and will match their answer to a letter on the decoder. As a group, they will make 4-letter words with their answers. If they get letters that do not make a word, that tells them to double-check their work. Every child is responsible for their own work, and they will do a problem different from their peers so everyone in the group will have a job. The project is structured for the students with a worksheet for them to do each of the problems and check their work.