How do you multiply number only in a box along with text but don't multiply the text?

[Abhi]

It showing error

[ABG]

Number Only is not the number, it is a true/false flag controlling the input keyboard.

Use textbox.text to get the number.

[Abhi]

Iam almost there

[Abhi]

And multiply only numbers

[Juan_Antonio]

[ABG]

If you are getting the text from a text box, you have control over the GUI.
Add extra text boxes for fractional parts, or use list pickers to identify scale (m/cm)

[NishyanthKumar]

Splitting with Regex would be better:

(I'm using KevinKun's regex extension)