HKIMO 2019 Grade 5 National Final (Heat) Set 02 Question 7

Find $\frac1{2\times5}+\frac1{5\times8}+\frac1{8\times11}+\cdots+\frac1{26\times29}+\frac1{29\times32}$.

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