Custom Formula Field. Multiplying a field by a whole number

Hi I am looking to create a simple formula. I would like to multiply a number field by a fixed %

I have tried the formula a few different ways.

Abs(${Number Field} *.75)

and

${Number Field} *.75

and a few others.

${Number Field} *.25

and a few others.

If there is a way to take a specific field A and put multiply ( Field B (A*.75) and Field C Multiply Field A *.25)

Thank you in advance for your help.