Red is rouge, blue is bleu and so on.
I give them 'colour sums':
rouge + bleu = ?
jaune + bleu = ?
blanc + rouge = ?
The activity is engaging and they get all the answers right: violet, vert, and rose.
So far, so good.
The next one pops up onto the slide:
noir + blanc = ?
M's hand shoots up: marron!
Odd. He's got them all right so far. Why does black and white make brown? I don't get it...
It took me a while to understand, but he's not wrong.