How Old Is Mr. Tortoise?

Itâs Mr. Tortoiseâs birthday, and he canât wait to eat cake with his friends. But thereâs a hitch! Mr. Tortoise canât remember how old he is, so his friends donât know how many candles to put on the cake. And they wonât stop (or slice) until they figure out the mystery.
Could Mr. Tortoise be as many years old as there are sections on his shell? Heâs twice as big as the smaller tortoise . . . so is he twice as old? After the partygoers work through a variety of possibilities, they find their way to the answer with a simple bit of addition.
With text from I Donât Want to Be a Frog author Dev Petty and hilarious graphic novelâstyle illustrations from Ruth Chan, How Old Is Mr. Tortoise? will have readers guessing the answer from beginning to end.