Public Class Form1
    Dim first As Integer
    Dim algebra As Decimal
    Dim holding_bay As Decimal
    Dim answer As Decimal

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        tb_1.Text = tb_1.Text & "1"
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        tb_1.Text = tb_1.Text & "2"
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        tb_1.Text = tb_1.Text & "3"
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        tb_1.Text = tb_1.Text & "4"
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        tb_1.Text = tb_1.Text & "5"
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        tb_1.Text = tb_1.Text & "6"
    End Sub

    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        tb_1.Text = tb_1.Text & "7"
    End Sub

    Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
        tb_1.Text = tb_1.Text & "8"
    End Sub

    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
        tb_1.Text = tb_1.Text & "9"
    End Sub

    Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
        tb_1.Text = tb_1.Text & "0"
    End Sub

    Private Sub btn_dotpoint_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_dotpoint.Click
        tb_1.Text = tb_1.Text & "."
    End Sub

    Private Sub btn_clear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_clear.Click
        tb_1.Text = ""
    End Sub

    Private Sub btn_plus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_plus.Click
        tb_1.Text = first
        first = "add"

        Process()
    End Sub

    Private Sub Process()
        Select Case algebra

            Case "add"
                holding_bay = Convert.ToDecimal(first)
                tb_1.Text = ""
                answer = holding_bay + first

        End Select
    End Sub

    Private Sub btn_equals_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_equals.Click
        tb_1.Text = answer

    End Sub
End Class