Basic subtraction of numbers is easy because we do not get to add and carry. However, when subtracting three digit numbers, we may be required to borrow numbers from other places. This is easy once you catch the trick. However, you have to develop some form of interest to do this. We have made it easy by integrating this exercise in a zombie board game online. Children will love subtraction if they play this game. This is a huge benefit for teachers in search of fun ways to teach math and parents who want to homeschool their kids. This board game is free and always online. For second grade, third grade, fourth grade, fifth grade, sixth grade and seventh grade students.