Question

90 dL times L/dL equals what

Answer 1

Explanation:

As your post is written 90 dL * L / dl = 90 L

But I think what you really want is the conversion factor for L to dL :

one liter is 10 dL :

L / 10 dL

then you question becomes

90 dL * L / 10 dL = 9 liters