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yes
The least number of significant figures in any number of the problem determines the number of significant figures in the answer which in this case is 656.64
That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.
one over two
you can not simplify fractions when one of the ( whole or part) numbers can not be divided by and thing like 11 over 17 could NOT be simplified