How To Get Decimal As Degrees / Minutes And Seconds

First of all I got app to convert Degrees, Minutes and Seconds to decimal. But now I need to get Decimal back to Degrees, Minutes and Seconds and I can't get it how to make it because I'm terrible with math formulas... Here is what I done so far:

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox4.Text = TextBox1.Text + (TextBox2.Text * 1 / 60) + (TextBox3.Text * 1 / 60 * 1 / 60)
End Sub
End Class

Textbox1 - Degrees
Textbox2 - Minutes
Textbox3 - Seconds
Textbox4 - DECIMAL RESULT