This document outlines important concepts and skills in mathematics that students need to learn, according to the National Council of Supervisors of Mathematics (NCSM). It discusses 13 areas of mathematics and 10 basic skills, focusing on whole number concepts. These include prenumber skills like attribute recognition, sorting, patterning and comparison. It also discusses the stages of learning the concept of whole numbers, including counting, numerals, number principles and counting stages. The document provides examples for teaching these concepts to students in grades K-2.