Lily is helping organize books in the library. She starts with book number 345 and needs to count backward by ones to find book number 339. How many books will Lily count as she looks for the right one?

Max is arranging toy cars on shelves. He puts 5 cars on each shelf and wants to count how many cars he has in total. If he counts by fives and stops at 60 60, how many shelves did he fill?

Sarah is collecting stickers for her album. She starts with 250 stickers and adds pages that hold 100 stickers each. If she counts forward by hundreds and stops at 650, how many new pages did she add to her album?