Question

WHAT DID HE DO WRONG
333/1,000 = 0.333 =0.3

Answer 1

He thought the 0.333 was continuing, so he rounded. However, the answer ISN'T continuing, so he shouldn't round.

Hope this helps!

Answer 2

He dropped 2 of the 3 in the last simplification and you can't do that. You can't just get rid of two of the values that make up the number. The farthest you are able to simplify is 0.333.