Diesel Expression to Divide Field Format Code by 10

Is it possible to create a diesel expression to divide a field format code
by 10?
The field format code is: %<\AcObjProp Object(%<\_ObjId
2126431928>%).CustomScale \f "%lu2%ct1%qf2816">%/

This is a Object, Viewport, Custom Scale, -Field Format Code.
The number returned by the format code, in this case, is 50. I need the
number 5 returned by the expression.

My understanding of the formatting code is:
that a conversion code (CTx), where x is 1-4, can be used in the string
"%lu2%ct1%qf2816">%/

1. Inverse value (1/x)
2. Foot to inch (x*12)
3. Inch to Foot (x/12)
4. Square inch to square foot (x/12*12)

This however, does not include an expression to divide or multiply by a
specified value.

Would someone be kind enough to lend a hand, or steer me in the right
direction?
Thank You