Maths

Little RALPHY returns from school and says he got an F in arithmetic.

'Why?' asks the father?

'The teacher asked 'How much is 2x3,'' I said '6', replies RALPHY.

'But that's right!' says his dad.

'Yeah, but then she asked me 'How much is 3x2?''

'What's the difference?' asks the father.

Spoiler:

'That's what I said!'