Question

What is a decimal between 0.5 and 0.75

Answer 1

A decimal point between .5 and .75 is .6 .   I thinks this is what you are looking for.

Answer 2

Anything between 0.51-0.74 you don't want to have a third place though unless your teacher allows it. So anything like 0.57, 0.6, 0.65 should be good if you're looking for any decimal.