We all make mistakes. Maybe you forget to move the decimal and get a crazy number. That’s okay—it’s part of the learning. A good sanity check: if you divide a whole number by a percentage less than 100%, your answer should always be larger than the original number. If it’s smaller, you flipped something. Go back and check your decimal.
And if you accidentally divide by 100% (which is 1.00), you just get the same number back. That’s like asking, “How much is 100% of my pizza?” Answer: the whole pizza. Boring, but satisfying.