Start with by breaking  down to ,
then writing those over 1:



Then multiply by three unit fractions to change each of the the yd. to ft.



Then multiply by three unit fractions to change each of the the ft. to in.



Then multiply by three unit fractions to change each of the the in. to cm.



Now we cancel the yd:



Now we cancel the ft:



Now we cancel the in:



And we have left:



And that calculates out to be



If you like you can cancel the units as you go instead of waiting till
the end.

Edwin