HKIMO 2017 Grade 5 National Final (Heat) Set 04 Question 7

Find $\frac1{3\times4}+\frac1{4\times5}+\frac1{5\times6}+\cdots+\frac1{15\times16}+\frac1{16\times17}$.

Source glossary (English–Vietnamese): Value: giá trị.