Someone

//get the number of big squares / row
    DWORD dwBigSquare   = (DWORD) sqrt((double)MAX_NUMBERS);

    float tt = (square % dwBigSquare);
    if (tt == 0) tt = 3;
    DWORD dwBigColumn   = (DWORD) tt - 1;

    tt = ((square - 1) / dwBigSquare);
    DWORD dwBigRow      = (DWORD) ( tt );
    
    DWORD dwStartX, dwStartY;
    dwStartX = dwBigColumn * dwBigSquare;
    dwStartY = dwBigRow * dwBigSquare;

    DWORD dwStartPosition = dwStartY * MAX_NUMBERS + dwStartX;

    DWORD dwEndX = dwStartX + dwBigSquare;
    DWORD dwEndY = dwStartY + dwBigSquare;

    
    for(DWORD y = dwStartY; y < dwEndY; y++) {
        for(DWORD x = dwStartX; x < dwEndX; x++) {
            cout << m_dwBoard[y*MAX_NUMBERS + x] << "\t";
        }
        cout << endl;
    }