Respuesta :

The common denominator of 2/5 and 1/10 is 10
Answer:

Okay, we have two different fractions that have a different denomiantor (denominator is the second number or the one on the bottom of each fraction or ratio!) so you need to multiply to get the common one so 5 x 10 equals 50 right so now this would be 2/50 and 1/50! 
Hope I helped! :D