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Previous Day  This starter is for 16 November  Next Day
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One possible method of systematically counting the rectangles it to start by looking at all of the points that could be the top left corner of a rectangle. These have been numbered working from top left to bottom right.
Now take each of these 'corners' in turn and count how many rectangles can be found containing this corner at the top left. The results are shown in the table below:
Corner  Number of rectangles  View rectangles 
1  1  
2  3  
3  2  
4  3  
5  1  
6  5  
7  3  
8  2  
9  2  
10  2  
11  1  
12  1  
Total:  26 
Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
Teacher, do your students have
access to computers? 

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Other shape counting starters:
How Many Squares 1?
 How Many Squares 2?
How Many Triangles 1?

How Many Triangles 2?  How Many Triangles 3?
How Many Rectangles?
 Rectangles Investigation 
Icosahedron 
Mystic Rose