All digits between the first non-zero digit and the last non-zero digits are significant. Some would argue that trailing 0s are significant since they are an indication of the precision of the number.
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A.when its between two digitsB.When it is right to the right of the decimal and it follows a non-zero digit.
If I understand this convoluted sentence correctly, then think it is true.
I'll assume you're asking about zeros. Zeros appearing anywhere between two non-zero digits are significant. In the other two cases they could be, but are not necessarily significant.
It is not a question of invention. The procedure follows from the fact that a decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.
That is correct.