: Heavy use of letter symbolism starting early in the 5th grade.
Teachers often grade students on their ability to explain solutions orally, not just written work. : Heavy use of letter symbolism starting early
(Russian: Готовые Домашние Задания ) refers to collections of "Ready Homework Assignments." These are solution manuals that provide step-by-step answers to every exercise in standard textbooks like Makarychev's. : Heavy use of letter symbolism starting early