Years ago my dsis patiently sat & taught the theory of gravity to dd (then aged about 8). dd then proudly announced that she knew all about it & proceeded to give a very lucid explanation, which impressed us all no end. Unfortunately she spoilt it a bit by asking , 'but Auntie X, how does gravity get upstairs?'
martianbishop - I usually end up teaching the "cabbage maths" type child (their expression not mine!) improper fractions because without it they will have no chance with understanding and reading music.
After a very frustrating 5 minutes ds (who is 4) can usually be heard to say from the living room. "8 quavers make 4 crochets, HOW LONG CAN IT TAKE TO GET THAT?!"
Funnily enough the music student's concentration is kickstarted by a 4 year old suggesting they are stupid.