Students must first work out the value of the given centre object. They then must generate and answer questions which satisfy the conditions of the headings: more, same and less.  They must try and make the minimum change possible to complete the other boxes.

To complete the other boxes pupils have to change one aspect of the center object, whilst simultaneously having to control for another change.

This means pupils have to attend to how changing one aspect of the centre objects changes another, meaning they have to think about *how* the change they are making affects the second property.

 

For example:

Students must first calculate the area of the trapezium in the middle-box.

They then use this information to help them fill the other boxes.

Three examples are below.

Sometimes it may be that not all boxes are possible, and often there are multiple ways to fill each box. This can help to stimulate class discussions and build connections. 

For more information on the grids you can watch our video with Tom Manners on YouTube:

https://www.youtube.com/watch?v=X3tTfxjuQvM

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