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http://jsfiddle.net/BjtNY/291/

<style>
#Numberlist.dropdown-menu{
min-width: 200px;
}  
</style>


<nav class="navbar navbar-default navbar-static-top" role="navigation">
    <ul class="nav navbar-nav">
        <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">List Item1</a>

            <ul class="dropdown-menu" id='Numberlist'>
                <ul class='list-inline'>
                    <li><a href="#" id="">1</a></li>
                <li><a href="#" id="">2 the number list</a></li>
                <li><a href="#" id="">1 the number list</a></li>
                <li><a href="#" id="">2 the number list</a></li>
                <li><a href="#" id="">3 the number list</a></li>
                <li><a href="#" id="">4 the number list</a></li>
                <li><a href="#" id="">5 the number list</a></li>
                <li><a href="#" id="">6 the number list</a></li>
                </ul>
            </ul>
            
        </li>
        <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">List Item2</a>

            <ul class="dropdown-menu" >
                <ul class='list-inline'>
                    <li><a href="#" id="">1</a></li>
                <li><a href="#" id="">2</a></li>
                <li><a href="#" id="">1</a></li>
                <li><a href="#" id="">2</a></li>
                <li><a href="#" id="">3</a></li>
                <li><a href="#" id="">4</a></li>
                <li><a href="#" id="">5</a></li>
                <li><a href="#" id="">6</a></li>
                </ul>
            </ul>
            
        </li>
    </ul>
</nav>