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A numerical expression is defined as a combination of numbers and one or more operation symbols. An example is 5 + 7 - 1.
The basic symbols are I,X,L,C,D&M
Numerical Expression: 1.) 20+2-8 ( Or any other number with two symbols on math ) Algebraic Expression: 2.) h x 2 ( Or any other number using only one symbol an a letter ) The difference between a numerical and algebraic expressions is that numerical expressions use only numbers, but algebraic expressions use letters as variables to represent numbers.
Because you need symbols, that occupy only one 'place', for sixteen digits, and we only have ten common numerical digits.
it is a varible