Module MATHs
    Public Function LTrim0(ByVal strVar As String) As String
        Do Until Len(strVar) = 1 Or Left$(strVar, 1) <> "0"
            strVar = Mid$(strVar, 2)
        Loop
        LTrim0 = strVar
    End Function
 
    Public Function Add(ByVal strNo1 As String, ByVal strNo2 As String) As _
      String
        Dim bytSum As Byte
        Dim bytCarry As Byte
        Dim lngMax As Long
        Dim lngVar As Long
        Dim strSum As String = ""
 
        strNo1 = LTrim0(strNo1)
        strNo2 = LTrim0(strNo2)
        lngMax = IIf(Len(strNo1) > Len(strNo2), Len(strNo1), Len(strNo2))
        strNo1 = Right$(New String("0", lngMax) & strNo1, lngMax)
        strNo2 = Right$(New String("0", lngMax) & strNo2, lngMax)
        For lngVar = Len(strNo1) To 1 Step -1
            bytSum = Val(Mid$(strNo1, lngVar, 1)) + Val(Mid$(strNo2, lngVar, _
              1)) + bytCarry
            strSum = bytSum Mod 10 & strSum
            bytCarry = bytSum \ 10
        Next lngVar
        If bytCarry Then strSum = bytCarry & strSum
 
        Return strSum
    End Function
 
    Public Function Divide(ByVal strNo1 As String, ByVal strNo2 As String) As _
      String
        Dim bytQuo As Byte
        Dim lngVar As Long
        Dim strQuo As String = ""
        Dim strDiv As String = ""
        Dim strVar As String = ""
 
        strNo1 = LTrim0(strNo1)
        strNo2 = LTrim0(strNo2)
        lngVar = Len(strNo2)
        strDiv = Left$(strNo1, lngVar)
        Do While lngVar <= Len(strNo1)
            strVar = Subtract(strDiv, strNo2)
            bytQuo = 0
            Do While Left$(strVar, 1) <> "-"
                bytQuo = bytQuo + 1
                strVar = Subtract(strVar, strNo2)
            Loop
            strQuo = strQuo & CStr(bytQuo)
            lngVar = lngVar + 1
            strDiv = Subtract(strNo2, Mid$(strVar, 2)) & Mid$(strNo1, lngVar, 1)
        Loop
 
        Return LTrim0(strQuo)
    End Function
 
    Public Function Modulo(ByVal strNo1 As String, ByVal strNo2 As String) As _
      String
        Return Subtract(strNo1, Multiply(strNo2, Divide(strNo1, strNo2)))
    End Function
 
    Public Function Multiply(ByVal strNo1 As String, ByVal strNo2 As String) As _
      String
        Dim bytPrd As Byte, bytCarry As Byte
        Dim lngVar1 As Long, lngVar2 As Long
        Dim strPrd As String, strVar As String
 
        strNo1 = LTrim0(strNo1)
        strNo2 = LTrim0(strNo2)
 
        If Len(strNo1) > Len(strNo2) Then
            strVar = strNo1
            strNo1 = strNo2
            strNo2 = strVar
        End If
 
        strPrd = "0"
 
        For lngVar1 = Len(strNo1) To 1 Step -1
            strVar = New String("0", Len(strNo1) - lngVar1)
            bytCarry = 0
            For lngVar2 = Len(strNo2) To 1 Step -1
                bytPrd = Mid$(strNo1, lngVar1, 1) * Mid$(strNo2, lngVar2, 1) + _
                  bytCarry
                strVar = bytPrd Mod 10 & strVar
                bytCarry = bytPrd \ 10
            Next lngVar2
            If bytCarry Then strVar = bytCarry & strVar
            strPrd = Add(strPrd, strVar)
        Next lngVar1
 
        Return strPrd
    End Function
 
    Public Function Subtract(ByVal strNo1 As String, ByVal strNo2 As String) As _
      String
        Dim bytDif As Byte
        Dim bytCarry As Byte
        Dim lngVar As Long
        Dim strDif As String = ""
        Dim strVar As String = ""
 
        strNo1 = LTrim0(strNo1)
        strNo2 = LTrim0(strNo2)
        If Len(strNo1) < Len(strNo2) Or (Len(strNo1) = Len(strNo2) And strNo1 < _
          strNo2) Then
            strVar = strNo1
            strNo1 = strNo2
            strNo2 = strVar
        End If
        strNo2 = Right$(New String("0", Len(strNo1)) & strNo2, Len(strNo1))
        For lngVar = Len(strNo1) To 1 Step -1
            bytDif = Val(Mid$(strNo1, lngVar, 1)) - Val(Mid$(strNo2, lngVar, _
              1)) - bytCarry + 10
            strDif = bytDif Mod 10 & strDif
            bytCarry = 1 - bytDif \ 10
        Next lngVar
        strDif = LTrim0(strDif)
        If strVar > "" Then strDif = "-" & strDif
        Return strDif
    End Function
End Module