The development of mathematical activity in children the place of the problem in this development

Bibliográfalaš dieđut
Searvvušdahkkit:	Association of Teachers of Mathematics. Research and Development Panel, British National Committee for Mathematics. Sub-Committee on Mathematical Instruction
Materiálatiipa:	Girji
Giella:	eaŋgalasgiella
Almmustuhtton:	Nelson (Lancs.) Association of Teachers of Mathematics c1966.
Fáttát:	Mathematics > Study and teaching.