Generally speaking, girls' logical thinking ability is relatively poor. Piano and painting do not belong to logical thinking ability, but are controlled by the left brain, while people with good numbers generally have a good right brain, develop more right brain and do things with their left hand.

Another reason is that mathematics is a compulsory course, and learning pressure is great, so children also have the psychology of resistance and boredom. Moreover, learning piano and painting, there is no pressure to go to school, and she naturally likes it.

I hope my parents can adopt my answer, thank you!