These ten practice pages align to the new Common Core standards for first grade. There are five pages of subtraction practice with numbers 0-10 and five pages of subtraction practice for 1-20. I use these practice pages as spiral practice of a concept for morning work. I also use one for a quick assessment to see if students have mastered the concept. Aligned practice of the same concept is important and much of the published materials do not provide enough practice of the same concept. These practice pages will give your students the practice they need to master subtraction 1 to 20.