Problem solving multiplication of two matrices with entries decimal

Option Explicit

Public MatrixA(30, 30) As Long
Public MatrixB(30, 30) As Long
Public MatrixC(30, 30) As Long
Public RowA As Integer
Public ColA As Integer
Public RowB As Integer
Public ColB As Integer

Function ProperMaticesSizes() As Boolean
    If ColA <> RowB Then ProperMaticesSizes = False Else ProperMaticesSizes = True
End Function

Sub ReadMatrixA()
Dim i As Integer
Dim j As Integer
Dim intLastRow As Integer
Dim intLastCol As Integer

Sheets("Sheet1").Activate

intLastRow = ActiveSheet.UsedRange.Rows.Count
intLastCol = ActiveSheet.UsedRange.Columns.Count

For i = 1 To intLastRow
    For j = 1 To intLastCol
        MatrixA(i - 1, j - 1) = Cells(i, j)
    Next
Next
RowA = intLastRow
ColA = intLastCol

End Sub
Sub ReadMatrixB()
Dim i As Integer
Dim j As Integer
Dim intLastRow As Integer
Dim intLastCol As Integer

Sheets("Sheet2").Activate

intLastRow = ActiveSheet.UsedRange.Rows.Count
intLastCol = ActiveSheet.UsedRange.Columns.Count

For i = 1 To intLastRow
    For j = 1 To intLastCol
        MatrixB(i - 1, j - 1) = Cells(i, j)
    Next
Next
RowB = intLastRow
ColB = intLastCol

End Sub

Sub MultiplyMatrices()

Call ReadMatrixA
Call ReadMatrixB

If ProperMaticesSizes = False Then
    MsgBox "Wrong matrices sizes. Re-dimension them"
    Exit Sub
End If

Sheets("Sheet3").Activate

Dim i As Integer
Dim j As Integer
Dim k As Integer

For i = 1 To RowA
    For j = 1 To ColB
        MatrixC(i - 1, j - 1) = 0
        For k = 1 To ColA
            MatrixC(i - 1, j - 1) = MatrixC(i - 1, j - 1) + MatrixA(i - 1, k - 1) * MatrixB(k - 1, j - 1)
        Next
        Cells(i, j) = MatrixC(i - 1, j - 1)
    Next
Next

End Sub