Color By Numbers For Kids Addition And SubtrAction Work Book. After color by number, you should get your child a color by math Activity Book. Why? Because you want him to be comfortable in arithmetic and the traditional learning technique of coloring will pave the way for that. Here, your child will be asked to solve simple equations in order to come up with the right colors to use.You can gift this colorful book a gift to your kids ones special days* Valentines day* Mothers day* Wedding anniversary* Birthday* Christmas days . On other days you can give this coloring book as a gift to your kids one.