How to convert 4 to 1 0 convert 1 number to 2 number

Question

I'm trying to separate 1 number to 2 numbers like this:
 [4.]
 [4.]
 [4.]
 [4.]

>>>

[1,0.]
 [1,0.]
 [1,0.]
 [1,0.]

First I was able to transform the [4.] to [10.] but I can't separate the 1 and the 0. Anyone got an idea please?