Turn your first graders into adding machines! This is a fun way to practice single-digit addition, and scholars complete 25 equations. Each machine has a function; five numbers go into the machine, are added to, and emerge on the other side as a sum. There is an entire example machine for learners to use as guidance. Consider making this even more fun by bringing volunteers up to physically don a math machine costume. Challenge them to add numbers quickly using a given function like these.