Here's another great extension for a paired reading of the books, One Grain of Rice and The King's Chessboard, two books that explore the concept of doubling.
I asked my son which he would rather have:
1. a penny today that would then double each day for a week.
2. one dollar.
I made a handout for him to record his thought using words, pictures and/or numbers.
Print the handout and try it with your kids. I'd love to know what methods they used to solve the problem.
P.S. After he chose "A", I gave him the $1.27. He eagerly put it in the coin box he made in Sunday School and then put it in the offering at church. His idea. Happy sigh.