Programas en Visual Basic (Pasa de Horas a Minutos y Segundos)

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
    End Sub
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    End Sub
    Private Sub text1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles text1.TextChanged
    End Sub
    Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        text2.Text = Val(text1.Text) * 60
        text3.Text = Val(text1.Text) * 60 * 60
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        End
    End Sub
End Class

Programas Visual Basic (Multiplicacion y Divicion)

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        text3.Text = Val(text1.Text) * Val(text2.Text)
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        text3.Text = Val(text1.Text) / Val(text2.Text)
    End Sub
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        text1.Text = ""
        text2.Text = ""
        text3.Text = ""
    End Sub
    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        End
    End Sub
End Class

Multiplicacion

Multiplicaciòn

Progrmas en Visual Basic (Suma y Resta)

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        text3.text = Val(text1.text) + Val(text2.text)
    End Sub
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        text3.Text = Val(text1.Text) - Val(text2.Text)
    End Sub
    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        text1.Text = ""
        text2.Text = ""
        text3.Text = ""
    End Sub
    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        End
    End Sub
  
End Class

Suma

Resta