It's a factor. This concept is widely used throughout algebra, and you'll probably bump into it through the end of high school and beyond.
A common use is expressing a term in <em>prime factorization</em>, or reducing a number to its most base parts- primes. For example:

Of course, a number like 13 which is already prime is made up of itself and 1. <em>Factors do not have to be primes.</em> 20 is also reducible through combinations of 1, 2, 4, 5, 10, and 20. Prime factorization is just a handy example.
Basically, factors multiply with each other to create other numbers, and numbers can be reduced down to their factors.
Answer:2.55 in fraction form is 51/20.
Step-by-step explanation:
Each friend should get 1/3 if there is only 2/3 left
The cat spends 70% if it’s day sleeping.
Jean jacket cost 178$ and 4 of jeans cost 356$ total is 534