There are 519 learnable concepts in total. (GK: 64 concepts; G1~G5: Approximately 90 concepts)
In CCSS(Common Core State Standards), even when the students are learning the same content, they can each learn it individually by separating the concepts according to a method or strategy.
For example, when learning adding two-digit numbers, students will learn separately by using methods such as hundred charts, number lines, and the break-apart strategy.
There are around 90 concepts per grade level.