Kids Riddles

Question: No matter how hard you try,
I can open what you can't.
If it wasn't for me,
on your front porch you would stand.

What am I?

Question: What temperature is twice as hot as 0 degrees Celsius?

Question: I live off of a busy street,
if you want you can stay for an hour or two,
but if you don't pay rent I'll tell on you.

What am I?

Question: What kind of math do Owls like?

Question: I was taking a plane to China and almost missed my flight. On my way to the terminal there were 7 other girls walking in the opposite direction. Each of these girls had 8 purses and each purse had 2 dogs.

How many in all were on the plane?