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.
You can read me both ways I wear; One way it's a number reversed a snare.
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I cannot be burned in fire or drowned in water. What am I?
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
Give it food and it will live, give it water and it will die.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic