Decimals can be a less intimidating way of writing fractions. The denominators for all decimals are based on powers of ten (100, 100, 1000, 10,000, etc.).
For example, five tenths can be written as 
or 
.
Seventy-eight hundredths can be written as 
or 
.
One hundred twenty-five thousandths can be written as 
or 
.
When visualizing what a decimal would look like, instead of breaking an object into thirds or fifths, break it into tenths, hundredths, thousandths, etc.
Here is 
, or 
:
Here is 
, or 
:
We could represent 
(aka 
) two ways:
Another trick: try visualizing the fraction as money. You could visualize 0.67 as 67 pennies, or 6 dimes and 7 pennies.