What's the benefit of using compromise projection like the Robinson projection

The Robinson projection minimizes distortion throughout most of the map. Although the Robinson projection is not conformal, the shapes that you can find within about 45° either north or south of the equator are generally represented with accuracy.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.