The research substantiates the pedagogical expediency and didactic value of the use of E-resources and modern IR technologies in the organization of distance learning in mathematics in primary school. A survey of primary school teachers and students was conducted in order to study the problem of forming an E-environment in mathematics in primary school. The authors identify the information resources of the e-environment and describe the method of their application in mathematics lessons. The study substantiates that in the organization of distance learning in primary school it is advisable to use gamified children's educational portal Vchy.ua (Вчи.юа), interactive learning platform to create educational material Classtime, designer of interactive worksheets Liveworksheets, create mental maps of mathematics lessons (FreeMind, Bubbl.us, MindMeister), virtual interactive whiteboards for group work with a variety of content with the ability to edit it together (Educreations, Padlet, Popplet, etc.), use a mathematical interactive constructor to illustrate Mathdisk, digital mathematical platform for independent, personalized learning (Matifik), digital textbooks with using interactive 3D-animations, educational videos and tasks (Mozaik education), to test knowledge with the help of test tasks (resource Liveworksheets, Kahoot!), etc.