Crumble tin

[PassiveAgressiveQueen]

My son is making a crumble at school.

I have never made a Crumble this small what size tin does he need?
750g fruit
150g flour etc.

I usually use 8ozs butter, 16 ozs flour etc.

Use the same ratio. So x fat to 2x flour and sugar as you usually do

Sorry you asked about thin , haven't a clue.