It's all FUN and GAMES! Busy Bee Subtraction through 10 is a fun way to practice math fact fluency! It is self-checking. Students graph results to show growth. They can even color their own certificates of achievement! There are 30 subtraction cards included. Aligned with common core for 1st grade. Also great to challenge some of your K students! I hope you enjoy Busy Bee Subtraction! Please leave feed back and check back soon for new game related products!