42/45 as a percentage is 93.33%. This value is rounded to two decimal places, so you can think of it as just a little under 94 % of a whole.
The fraction 42/45 is already in its simplest form. It shows that 42 parts out of a possible 45 are present, which is a very high proportion—almost the whole amount.
Because the percentage is so close to 100 %, this kind of number often appears in situations like test scores, project completions, or quality checks where almost everything meets the requirement.
When you need to report the result, just state the rounded figure 93.33%, and most readers will understand that the original fraction was 42/45.