Mathematicians have developed their own language. Many of their operations have been reduced to a few, concise, words. In turn those words have been shortened to symbols.
To cope with life maths is needed. To cope with maths a knowledge of the symbols is needed. What may be obvious to an adult may well be meaningless to a youngster. Learning the code is necessary to understanding, and hence to
This learning process involves understanding the meaning (of, say, addition); then the variety of words used for the 'togetherness' involved (addition, total, summation, complement - as in ship's complement, group, quantity, ...); then the symbols used for sum of these items (the plus sign, summation sign,