Because they are getting more time on their level in the areas of math, reading, and writing, they are making more progress with their school year than they normally would. The teachers work to address each student's needs. They provide a consistent, structured schedule. In Merrill's class, students are assigned into groups that begin each morning with different words and numbers of the day. They are different.
Some students have harder numbers and some have easier numbers.
It's a piece of meat. You eat it. Not only do they have to know what it means, but they have to use it in a sentence. Obviously 163 is a larger number than 56. Actually 56 is a very difficult number for the blue groups.