Why does ten plus ten equal eleven plus eleven?

Because ten plus ten equals twenty, and eleven plus eleven equals twenty too.

More dad jokes you'll groan at

Why is Peter Pan always flying? Because he Neverlands Can February March? No, but April May!What do you do to have a space party? You planet.How do trees get online? They just log on.Why are skeletons so calm? Because nothing gets under their skin.Once I read a book about glue. I couldn’t put it down.