In order that schoolchildren learned correctly to write, it is needed not only well to know the rules of Russian but also much to practice.A trainer, corresponding ФГОС, contains practical material on the basic themes of Russian for fixing and verification of knowledge. Various tasks on spelling of shock and unstressed vowels| of prefixes, suffixes, pretexts| of unpronounceable consonants in a root dividing "ь" and "ъ" and т. of д. will allow to the students to completion of 3th class структурировать the knowledge, in future to avoid errors at a letter and to take skill of literate letter to automatism, and verification work will show at the end of book, as far as material is qualitatively mastered.A manual can be used on the lessons of Russian, at the additional studying at a home, for the reiteration of the passed themes out of term and at the beginning of next school year, and also for preparations to control works and ВПР.A book will render an invaluable help to the parents and teachers in forming and fixing of skills of faultless letter and development of orthographic sharp-sightedness for third-form boy.