How is mahjong divided into sizes?

Depends on the length and width of the mahjong machine tiles.

Mahjong is an ancient Chinese invention of the game of gaming, card entertainment appliances, with bamboo, bone or plastic made of small rectangles, engraved with patterns or characters, each deck of 136 (some regions 74) southern mahjong more than eight tiles, respectively, spring, summer, autumn and winter, plum, bamboo, orchids and chrysanthemums, *** counting 144 tiles. The rules of the game are slightly different in different regions. The main types of mahjong tiles are "Cake (Wen Qian)", "Strip (Suo Zi)", "Wan (Wan Guan)" and so on.

Northern mahjong has 136 tiles per deck. Southern mahjong is usually 144 tiles, adding spring, summer, autumn and winter, with the eight flower tiles of plum, bamboo, orchid and chrysanthemum. There are also some places that add 1 tile each of Jubao Bowl, God of Wealth, Mouse, and Cat, and 4 tiles of Hundred Horses, for a total of 152 tiles.

In the Ming Dynasty, the prevalence of horse tiles at the same time, by the horse tiles and derived from a kind of entertainment equipment called "cardboard" theater. Cards start *** have 60. Fighting cards, each of the four first take ten, and then take the cards, playing cards in turn. One playing cards, two or even three at the same time, to get the first card for the winner. These tiles and the way they are played are much like today's mahjong tiles. This kind of card game in the process of playing always silent, so it is also called silent and cards.