The fraction 21/49 expressed as a percentage is 42.86%. This tells you that the part represented by 21 out of 49 is just under half of the whole.
If you simplify 21/49, you get the smaller fraction 3/7. Both fractions describe the same portion, and they still correspond to the same 42.86% when turned into a percent.
In everyday terms, if you have 49 items and you take 21 of them, you have taken about 42.86% of the total. Knowing the percent helps you compare this portion to other groups quickly and easily.
