Mongolian Game Puzzle. WORLD puzzles series

Shape is one of the mathematical concepts. The idea of the shape of an object is most easily acquired by the child at the time when he puts the parts into a whole.
Geometric puzzles are an excellent developmental aid. Playing puzzles, the child develops combinatorial abilities, holistic perception, arbitrariness of actions, imagination; they help to study geometric figures, give the child the concept of shape, size (including in comparison) of objects; develop fine motor skills of fingers, which affects the intellectual abilities of a person; realise the creative potential of children
In the methodical manual - methodology and schemes
The puzzle is a square cut into 11 parts: 2 squares, 1 large rectangle, 4 small rectangles, 4 triangles.
Puzzle size: 215*150*10 mm.