Why r radio station frequencies always odd (90.3, 90.5, 90.7 etc) in the US?!

Why r radio station frequencies always odd (90.3, 90.5, 90.7 etc) in the US?

Look for example at Berlin, Germany radio stations' frequencies:

StarFM 87,9;
radioBERLIN 88acht
91,4
93,6 JAM FM,
94,3 r.s.2
Radio 95,8
98.2
98.8 Kiss FM;

2 weeks ago
those are obviously ending on .4 or .3, seemingly erratically

As regulated by the FCC, the typical US FM Frequency Band is 88.0 to 108.0 MHz with a 0.2 MHz spacing (0.1 MHz above and below the station's frequency).

Also, radio station stay away from the edge of the band (by 0.1 MHz) and typically start at an odd frequency.

Based upon math when you add an odd number with an even number you get an odd number.

For example, 88.1 + .2 = 88.3 is the next available frequency... etc

That's why US radio stations are odd numbered.