15.6 times x can be written as
15.6x
Notice that we put the number before the variable, so we can't write x15.6, we write 15.6x.
We can also write 15.6*x, but we usually write it as 15.6x
So, 15.6 times x can be written as
15.6x (Answer)
Hope you find it helpful.
Feel free to ask if you have any doubts.