A pair of friends plan a birthday party as young readers learn basic mathematical concepts Ruffer the puppy has never had a birthday party, and Nora is determined to make her best friend's big day extra special. There's a lot to do to get ready, and Nora and Ruffer hit some bumps along the way. But with a plan, lots of effort, and teamwork, they cook up a delicious celebration with all their friendsand Ruffer has more fun than anyone! Hands-on activities and elementary math concepts that relate to numbers and operations, including addition and subtraction, expand this story about a pair of clever and resourceful friends.