Why do we need to compare numbers?

Question

[ALSO]: How can a numberline help us compare numbers?

Answer 1

Numberline?
Do you mean an average or a "mean"?
Apply for credit or buy a home, you'll quickly know why "numbers" should be compared.
Shop for the lowest interest rate, and compare them.

As for average, or a "mean", you'll know whether you are looking at numbers higher than the "mean average", below, or on a par.

A business always looks at the total industry averages for net profit, then compares theirs to that.