How do I solve this: 5π/4 + 2π

How do I solve this: 5π/4 + 2π?
and: -π/2 + 2π?

the first one can be write as 5*/4＋8*/4，so the answer is 13*/4
and the second one is -*/2＋4*/2＝3*/2
wish it helpful to you ..