: Working with area, perimeter, and spatial relationships.
: Introduction to parts of a whole and comparing fractions. : Working with area, perimeter, and spatial relationships
The by L.G. Peterson, published by Yuventa (often associated with the "School 2000" or "Perspective" programs), is widely considered one of the most challenging yet rewarding curricula in Russian primary education. Deep Review: Methodology & Content : Working with area
: Focuses heavily on the transition from simple arithmetic to abstract concepts. : Working with area, perimeter, and spatial relationships