This year’s Christmaths Advent Calendar will have a question for every day in December up to and including Christmas Day, each one featuring a new mathematical challenge.
Mary and Jason were making propellers for their wooden helicopters.
Mary put the number 1961 on her propeller and noticed that when she turned the propeller she had the same number.
Jason was trying to think of a number that he could put on his that had the same rotational symmetry (it looks the same when turned upside down).
What is the next larger number that has this property?
Got an answer? Please leave a comment below.