## Proof of rectangle areas on square grid using surds

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Sharing great ideas and resources with maths teachers

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I put together the following as an activity for a low-attaining year 8 class coming to grips with area. They’ve done area of rectangles and triangles last lesson and so I’m trying to link it to real world contexts this lesson. The idea is they cut out the shape for which they need to find the area, they then choose...

Here is something a bit special. It’s an amazing Geogebra applet that shows where the formula for the area of a circle comes from. I’ve had pupils cutting circles into sectors before to perform the same proof, but this interactive applet it first class in showing the concept in a visually stunning way and quickly. Top stuff! Click here to...

If you have never seen www.mrbartonmaths.com then you are seriously missing out! Mr B’s website is packed full of great maths teaching resources. These include some excellent ‘follow me cards’ for area and perimeter of squares, rectangles and triangles. I took this resource and slightly changed it so that the question and answers are not adjacent to each other on...

If you haven’t seen the NRich Maths website where have you been?! It’s a fantastic source of enriching activities. It’s usually my first port of call when I’m looking for ‘something a bit different’ for my own classes. Many of the resources are interactive and look great on the interactive white board. Each month NRich publishes a ‘virtual magazine’ which...

How do you teach kids to remember how to calculate areas of shapes? Here’s one method… Sing the following song to the tune of Pop Goes The Weasel: Verse 1: Multiply the length by the width Gives the area of a rectangle. Base times height divided by two Now gives a triangle. Verse 2: Half the sum of the parallel...