how reasonable something is
it means to use your head and explain what you solved
what does key mean in math
Approximately
about
It means the same in math as it means else where--it means not reasonable. If you show mathematical steps that are not reasonable to solve a math problem or show a math proof, then your math is unreasonable.
how reasonable something is
it means to use your head and explain what you solved
what does key mean in math
Approximately
about
a
In math terms, it is more or less to make something sound reasonable; but in a way that is less formal than a proof.
I do not know of such a word related to math(s)
There is no such math word, so it does not mean anything. You may wish to check your spelling before posting questions!
The word at means the least
the word by means 'times' or 'multiply'