For the three-dimensional vectors $\mathbf{u}$ and $\mathbf{v}$, find the sum $\mathbf{u}+\mathbf{v},$ the difference $\mathbf{u}-\mathbf{v},$ and the magnitudes $\|\mathbf{u}\|$ and $\|\mathbf{v}\|$.
$$\mathbf{u}=\langle 1,0,1\rangle, \mathbf{v}=\langle-5,0,0\rangle$$