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Which math master can solve this problem?

12*11=132 items.

Because it is: sending each other. So no need to divide by 2.

Twelve classmates send text messages to each other, and find out how many text messages they can send in total. This belongs to high school mathematics permutation and combination knowledge, so the algorithm is as follows: 12 multiplied by 11 equals 132. The general *** sent 132 text messages.

Definition

Addition: The operation of combining two numbers into one number.

Subtraction: The operation of finding the sum of two addends and one of the addends to find the other addend.

Multiplication: The operation of finding the product of two numbers.

Division: The operation of finding the product of two factors and one of the factors to find the other factor.