Answer:
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
I build bridges of silver and crowns of gold. What am I?
I am an English word with 3 consecutive double letters.
I can be driven but have no wheels. I can be sliced but still remains whole
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic