Saturday, 10 March 2018

Part Part Whole, Bar Model & Perimeter

Earlier this year, we were calculating perimeter of compound shapes with some missing measurements. Some children were struggling to work out which measurements were missing. 

So, we took to using the bar model to offer some support.

1. Count the sides of the shape
2. Colour horizontal sides one colour and vertical sides another colour
3. Identify which sides have an unknown length
4. Use 'Part Part Whole' bar model (one for horizontal and one for vertical) to help find missing lengths
4a. The bar models can also be colour coded the same as the sides
5. Check the number of lengths found matches number of sides and looks sensible 
6. Add them up...

It worked well for us. Of course, as always with the bar model, it will help work towards an answer, but not give an answer. 

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