For all three you should easily get mid to high $x,xxx
and maybe more.
There is probably good documentation on what
3 digit .coms go for nowadays, lots of people looking for
them in the domains wanted thread. They either list
their budget or would make you an offer.
Obviously there are only 1000 possible three
digit number dot coms, and all are taken, so they are
pretty rare.
These kind of names are especially useful because
they can be used by non-english speaking populations
for websites that are easy to remember. Lots of
China websites are just numbered dot coms, for example.
These kind of domains are almost guaranteed to keep
increasing in value over time, so it's like an investment.
Another idea, if you are going to sell, would be to find
the highest offer you can, then start an auction in the
domain auctions thread at that price. That would tell
you the kind of demand there is.
Good luck (not that you need it with those names)