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What is ... in mathematics?
In mathematics, "……" means remainder, which is called remainder symbol.

In division, there are only two situations: divisible and irredivisible. When it is not divisible, it will produce a remainder, so the remainder problem is very important in primary school mathematics.

Long, long ago, people just changed from apes to humans, hunting for a living. Because there are too few prey, they have to divide the food equally. When everyone is given the same amount of food, there will be some left, but there is not enough food to share again. This unfinished part is called the remainder.

When writing, quotient and remainder are separated by six points, which is called remainder. In the vertical form, the divisor subtracts the product of quotient and divisor to get the remainder.

In the process of division, the part that is not divided is called the remainder, and the remainder must be less than the divisor.