I'm struggling with this problem

> 
> Compute the following sum:
> 
> 
> $$ \frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times4} + \cdots +\frac{1}{99 \times 100} $$
> 
> 
> Hint: Consider telescoping series,
> 
> 
> 

Please help me.