Development kit - Mental arithmetic. Step 2. Adding and subtracting on the abacus.

The "Mental Arithmetic" series is a program for developing children's mathematical abilities, training in oral calculation and mental arithmetic without a calculator.How to play? The contents of this box represent the second stage of mastering mental arithmetic and will help the... child learn to add and subtract on the abacus. The unique mechanics of sequential learning allow for immersion in the world of mental arithmetic: the cards themselves indicate when it's time to move on to practice. All task cards are laminated. The set includes a marker that can be used to write on the cards. The writing can be erased with the reverse side of the marker.Attention! The abacus is not included in the set. If the child is not yet familiar with the representation of numbers on the abacus, please refer to the set "Mental Arithmetic. Step 1".Inside you will find: - 36 cards,- dry-erase marker,- rules.