Although the Farm School Math Program, Patterns in Arithmetic, was developed before "Common Core" and other current states curriculum mandates, there are lessons that correlate with specific standards. Our math series fulfills some of the Common Core Standards.
Nonstandard breaking up for division and subtraction, and nonstandard measurement, for example, are lessons in this developmental sequence that are not generally found in other programs.
Below are listed the standards a booklet covers.
Patterns in Arithmetic: Subtraction - Booklet 3 Common Core Standard
General Principles of Regrouping Entire booklet 3 NBT A2
Explain why addition and subtraction strategies work 2 NBT B9
Fluently subtract to one thousand using regrouping 2 NBT B7