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Broadbent Maths - creative primary maths

Which models and images would you use for addition and subtraction in Y4?

Representation using models and images is something that should be considered in every unit, but you're right, it is not always obvious what is the best model or image to use. It very much depends on where the children are in their learning (look at the bold parts of the small steps of progression on each unit planning template to help with this) and what they need to help them make sense of the maths.
You ask specfially about Unit 13  in Y4.  

You  will be focussing on problems that involve mental strategies and those that use larger numbers so using formal written methods.

Models and images for addition and subtraction include:
•  Base-10 (Dienes) material - essential for modelling decomposition and useful for partitioning with addition

•  Arrow cards - again useful for partitioning

•  Number lines if counting on for mental subtraction is the focus

• 100 square if support is needed in reinforcing strategies for mental addition and subtraction

• Ten frame if you have some low attainers that need support with crossing tens.

Y4U13
If you are focussing on written methods then make sure they understand the procedure . They can move on from models and images to a basic formal 'structure' (like a writing frame) so that they know the layout and the format.
 
Some of your high attainers may be going on to calculating with decimals so perhaps model this with Dienes material.
 
You may need to go back a few steps in case you have lower attainers  Take a look at how this ten frame is used for questions using numbers beyond 20.
For those of you reading this for different years and units, read it as an example of how to approach the issue of models and images.  Click on the Unit planning template to enlarge it and take a look at the small steps of progresion oin Unit 13 Y4 while you read my reply. 
10 frame
Here is a link to an artlice I wrote on using two 10- frames, more relevant for +/-  to 20, but you will see how it is used and you can develop it's use beyond 20. 
Using a twenty frame to represent addition

The suggested Calculation Policy resource may also be useful, so take a look at the maths topic area for the unit you are planing. 
Calculation Policies
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