Multiply, Times, Add same numbers, Product
The word multiple is a noun, a singular, common noun; a word for a number that can be divided by another number without a remainder.
LCM
The least common multiple, or LCM.
The word 'multiple' is a noun as well as an adjective. The noun multiple is a singular, common noun; a word for a number that can be divided by another number with no remainder. A number is a thing.
multiples
dozen
Multidisciplinary is another word for interdisciplinary, meaning involving multiple disciplines or fields of study to address complex problems.
It is many cells see multi is another word for multiple and multiple means more so more cells
Another word for a convention that includes "join" is "joint." This term is often used to describe events or gatherings where multiple parties come together for a common purpose.
Bountiful, large, and great. numerous a lot many multiple
Times, Per, Multiple, X, () are all words for multiply
That is a pretty specific word you got there, and there is no "real" synonym for it. You could explain the process of binary fission or you could compare it with multiple fission.