Fractions chat

Today, Natalie had the great idea of making chatter boxes with fractions we had added and subtracted. After a quick mini-lesson on how to make chatterboxes, we wrote fraction problems and possible answers on them and then we played with them.
(I liked trying to figure out what the answers were - Nat)

Some of the addition and subtraction problems we created using fractions were:
1/4 + 1/8 =           1/3 + 3/6 =         4/12 - 2/8 =           3/9 + 3/9 =                2/10 +4/10 =

Can you solve these fractions problems? How did you work them out?