Well I cant really give you a sure-fire rule for this. I think its more important to understand the concept as opposed to strict counting rules and so forth.

Basically, the way I look at it is that the position of the decimal point kind of trumps the strict sig-fig counting. In other words, when there is a decimal point in the least significant figure, you just pay attention to significant decimal places instead of the whole number.

So 1.1 has one significant decimal place and 11.5 does also. If it was 1.12, then you would report 11.52 and so forth. If all numbers have decimal places, then i tend to consider everything on the left side of the decimal as a place holder. There, i think thats your rule.

The easiest way to do it is to find your least significant number then look at what place that number goes to. For example, 1.1 goes to the the tenths place, in 257 it would be the ones place. Then round your answer to that place.