Mr Chang's Math Teaching/Learning Resource

My “value-add” folder at Google Drive

https://drive.google.com/open?id=1fh2rfUCWWqCEPoGUT1UW0DVo-53uKXz4

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Numbers

Rounding-off program

https://scratch.mit.edu/projects/219837076/#fullscreen

Short-cut for multiplying 2-digit numbers

https://www.instagram.com/p/BhTZmshBZOi/?taken-by=changchengliang

 

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Decimals

Rounding-off program

https://scratch.mit.edu/projects/219837076/#fullscreen

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Area of Triangles

Introducing The 3 Different types of Triangles

https://www.instagram.com/p/BgqvPauhRzs/?taken-by=changchengliang

Explore base and height of triangle

https://www.geogebra.org/m/r5Bhg59s

Proof by paper folding/cutting -- the formula of  area of triangle = half x base x height

https://www.instagram.com/p/Bg1WiBAhJXW/?taken-by=changchengliang

https://www.instagram.com/p/Bg5flQ7hGvc/?taken-by=changchengliang

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Volume of Cubes and Cuboids

The 1-m cube:

https://www.instagram.com/p/BhrWWpbhdsG/?taken-by=changchengliang

Have a sensing on how big/small various units (cm3, millimetres, litres, m3 ) are…

Check out their relationship with each other

https://drive.google.com/open?id=19DjtI1iP8dihbssbSeimuYImzmWtiHbS → by pupils of 5C(2018)

https://drive.google.com/open?id=132lV2i1OfmTSj5ZVjI8p-NKEgmj5KMwf → by pupils of 5E(2018)

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