Simple multiplication progran help needed

[Chris450]

Hi I just started playing around with Visual Basics and I tried to make a simple program to work out a price on a square item of steel, but I'm stuck. The program has to multiply the length, width, thickness, the rate, and the mass 8.3 rounded off standard and then decided by 100000 to get rid of all the 0's.

So If we have a 300 square plate that's 12mm thick the calculation will be 300 x 300 x 12 (thickness) x 12(rate in Rands) x 8.3 (constant) / 1000000 the answer will be 107.568.

Please help me this is what I have done.

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim num1, num2, num3, num4, num5, num6, product As Single
        num1 = TextBox1.Text
        num2 = TextBox2.Text
        num3 = TextBox3.Text
        num4 = TextBox4.Text
        num5 = Val(8.3)
        num6 = Val(1000000)
        product = num1 * num2 * num3 * num4 * num5 / num6


    End Sub