Devils Arithmetic chapters 14-16

What does Rivka share with the girls about the rest of her family? : Rikiva shares with the girls that all of her family is dead but her and her brother

Rivka shares the rules she follows to stay alive at the camp one day at a time. What are they? : Smile, call each other by real names, memorize each other's numbers, know when to fight and when not to, know who to talk to and who to avoid, listen, never stand next to someone with a G in her number, never go through the door to Lilith's Cave, know lower numbers can organize things, never ask why, and to help children go into the midden, learn to read prisoners' numbers.

Explain Rikiva's definition of The Devil's Arithmetic? : She shares that the cruel numbers of those processed and the rest of their remaining daysadd up or subtract to become the devil's arithmetic.

Why does Hannah think that Reuven's choosing was her fault? : She thinks she should have told the commandant that he was her brother.