Alternatively titled: Making 4-digit subtraction fun.
When I read books to our two younger girls, we always start by reading the year and city of publishing as well as the title and author.
Several months ago, our 7-year-old decided that books fall into two categories: BGG and AGG. Those stand for ” Before Great Grandma” and “After Great Grandma”.
If the book was published before 1924, then that gives her some context in which to put its age. If BGG, then the response is “Wow! That’s old.” If Great Grandma was a little girl, then still old but not quite as much. And so on.
It didn’t take long to figure out that asking how fast they could figure out the age of a book helped kill a second bird with the same stone.