Teaching and game set. The set consists of: 12 double-sided cards of light colour (white or grey), designed to remember the algorithm of adding numbers with the transition through the tens (within the first two tens). The cards have the shape of a gear (a circle with 12 semicircular cut-outs located along the entire length of the circle, the distance between the cut-outs is equal).
The cards are made of coated paper, the diameter of each card is 210 mm, each card has two holes with a diameter of 3 mm. In the centre of each card there are 12 tasks; the answers to the tasks are located next to the card cut-outs. The back of each card provides an opportunity for self-checking.
The cards are packaged in a square-shaped cardboard folder with a side length of 7mm
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