We use Cuisenaire rods lots in K3 as you know. It may be something you'd like to play with at home; they're available via for instance amazon, and we can recommend these wooden ones, made in Spain, as good value. And/or you may like your child to try one of the online Cuisenaire environments that we use at school. If you make anything, do take a photo or screengrab, and send it to us!
Daniel's got his own set and he's been busy creating equal-length trains, and writing equations to describe them:
|For Jacob's trains|
|for Edouard's trains|
|for Marcos' trains|