Pre-k and Kindergarten addition of single digit numbers Coffee quiz game - This is an interactive online game for students to review skills related to adding digit numbers. The fun part f this activity is the fact that students have to answer questions correctly in order to fill up coffee in a jar found in a coffee machine. The basics of the concept of addition will be understood in this game as summing up two digits. This is a basic addition activity for students from kindergarten to 3rd grade. This game is free and always online, hence parents and students can use it to review while at home or in the classroom. Have fun learning and improve your skills on addition.