Many of the students I see struggle to remember techniques, particularly when they are seemingly abstract.
Two main bits of inspiration brought me to re-teach ratio through bar modelling
(1) Concrete - Pictorial - Abstract
Research suggests students grasps concepts best if initially they can "play" with objects, then sketch it pictorially, before moving to the abstract technique.
(2) White Rose Maths Hub
With so many examples of bar modelling on their twitter feed @WRMathsHub, I visited their website and found a few bar modelling resources, here.
Ratio with Bar Modelling
Within the first 5 minutes the students appeared confident and comfortable with the new technique, and commented that it was much easier for them to understand what was going on.
Here is a little of their finished work:
These questions in their template can be found here.
