The standard form is 254,007,005
It means a number that can be expressed as a ratio (or two integers).
Numbers were invented to indicate quantity: how many of anything we had
A numberline is never-ending. It goes to infinity to the right and to negative infinity to the left... Not always it depends on what nimber line it is.
An imaginary number is a number that has the square root of -1 as one of its factors.