Those examples you provided can be written as bellow (I think it should help)
Двадцать два метра с половиной
Тридцать шесть метров с половиной
Thx. What about 36.5 метра then? The only way of justifying this one is the hint that they might be using the exact decimal form w/ five tenths of something etc.
Can you say both? I for one stick to the половина variant... => 36.5 метров