Teaching and game set. The set consists of: 12 double-sided cards of light colour (white or grey), designed for practice in addition and subtraction of round numbers.
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 packed in a square-shaped cardboard folder, with a side length of 220mm and a thickness of 7mm.
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