Private Sub GetCalculate4()
    Dim iMassiv1#(1 To 100), iMassiv2#(1 To 100)
    Dim iCount%, iSumProduct#
 
    For iCount = 1 To 100
        iMassiv1(iCount) = Rnd * 1000
        iMassiv2(iCount) = Rnd * 1000
    Next
 
    iSumProduct = Application.SumProduct(iMassiv1, iMassiv2)
End Sub

Private Sub GetCalculate5()
    Dim iMassiv#(1 To 100, 1 To 5), iSumProduct#
    Dim iColumn%, iRow%
 
    For iColumn = 1 To 5
        For iRow = 1 To 100
            iMassiv(iRow, iColumn) = Rnd * 1000
        Next
    Next
 
    With Application
         iSumProduct = .SumProduct( _
         .Index(iMassiv, 0, 1), .Index(iMassiv, 0, 5))
    End With
End Sub