3.17 How to find cummulative sum

compute $\sum _{k=1}^{10}\frac{1}{k(k+1)}$

Mathematica N[Sum[1/(k*(k + 1)), {k, 10}]]

0.9090909090909091

 

Matlab format long k=1:10; s=cumsum(1./(k.*(k+1))); s(end)

0.909090909090909