Divide

2
____
9
____
2

(2/9) / 2

= 2/9 * 1/2
= 2/18
= 1/9

Or, just consider that 2/2 = 1
so, 2 ninths / 2 = 1 ninth
2/7 / 2 = 1/7
2 dogs / 2 = 1 dog

just half of what you start with.