The fraction 3/7 is equal to 42.86% when converted to a percentage. This means that if you divide 3 by 7, you get a decimal that's just under half. It's a bit less than half because 50% would be 3.5/7, and 3/7 is slightly smaller than that.
In everyday life, you might see 3/7 or 42.86% used in various situations. For example, if 3 out of 7 people in a group prefer chocolate ice cream, you could say that 42.86% of the group likes chocolate best. Or if you complete 3/7 of a project, you've finished about 42.86% of the work. It's a useful fraction to know, especially when dealing with things that are often divided into sevenths.