: Concepts of rays, angles, and polygons (triangles, quadrilaterals) are further developed.

: Introducing formal vertical calculation methods (addition and subtraction "in a column") and working with parentheses to establish order of operations.

: Many find the curriculum demanding, often noting that the logic-based word problems can be tricky without teacher guidance. There is a frequent search for "otvety" (answers) because the "School 2100" methodology sometimes uses non-standard phrasing that can confuse adults accustomed to traditional methods.

: Building fluency in reading, writing, and comparing two-digit numbers.