Without missing a beat, the Duchess replied: "I’ve been very impressed by William’s geography."
Kate later teased William about his dancing, after the Cambridge's watched a performance in Bumburet.
After watching the dancers, Kate introduced her husband to the ladies, saying: “This is my husband William, Prince William. I’m sorry he didn’t dance too!”
Despite the jovial dig, the Duke - who shares children Prince George, 6, Princess Charlotte, 4, and Prince Louis,1, with Kate - seemed to take the slight in his stride, telling the ladies that he loved their moves.
The light mocking came after William teased his wife about her lack of science knowledge during a trip to the local school.
"This is the science class, yes? Some of the girls were saying that science is their favourite subject at school," Kate said upon entering the classroom.
"Do you remember the periodic table?" William teased.
"I knew that a long time ago, but Catherine you remember it well, don’t you?"
It seems these two can't help but take the mickey out of each other on this Royal tour!