Mathematics with taste. Oral account treasury quest. Addition and subtraction with the transition through a dozen. Astakhova N.

"Oral account is gymnastics for the mind." This simulator will help to make it interesting and diverse. This is the first acquaintance with the “school” receipt of the account with the transition through a dozen. The simulator contains all possible examples, grouped and served as a game. The simulator is suitable for teamwork. It is recommended for use along with the book “Quest Trinager Oral Account. Addition and subtraction ”, as well as notebooks for collective quests.