From a nursery ad:
"10’000’s of trees"
First of all, I would think it's thousands of trees, not ten thousands of trees. Second, you don't use an apostrophe to pluralize a number. It is true that you can use an apostrophe to pluralize something if ambiguity would result, as in "I got all A's." If you had no apostrophe, it would look like "As." However, there's no ambiguity with this number, so no apostrophe.
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