Originally Posted by Val
Originally Posted by ColinsMum
Yes, you're wrong, because you are assuming that such a number must be an approximation. It need not be; it might be a precise representation of a rational number, in which case appending a zero gives you a different representation of the same rational number, and is definitely correct.

Okay, might be. That's my issue with it. You don't know.

Math and physics books that deal with significant figures all tell you not to make that assumption. So my feeling here is that if it isn't an approximation, the math book should add the zero and make it clear.
How many zeros would you like them to add?

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