Dear students, 

I totally empathize with your situation. You have encountered an intriguing Math problem and do not know how to solve it. Try sending the problem here. 

Don't suffer in silence. I will get back to you ASAP. 

Do follow me on IG (@changchengliang) for the latest postings of my worked solutions.

Brush up your basic skills through...

👨‍💻Mr Chang's apps

resources



New features at next change

_

Math problems with my solution at my IG posts (https://www.instagram.com/changchengliang/)
Rudimentary skills at my IG posts(https://www.instagram.com/changchengliang/)

Reading numerals (numerals to words)

https://www.instagram.com/tv/B86H0p_HIS9/?


Estimation   https://www.instagram.com/tv/B22Ej-rH94o/?


Fractions

Writing mixed number from long division    https://www.instagram.com/p/BP8ebKkh1P-/?

Simplifying fractions    https://scratch.mit.edu/projects/284472200/fullscreen/


Percentage

The idea of percentage:   https://www.instagram.com/p/BPtFYsNDDjF/?https://www.instagram.com/p/Bl3QaRoHm2q/?


Similar triangles

Area of square   https://www.instagram.com/p/CYDhPmXJGmW/

Types of Triangles 
--- using strawshttps://www.instagram.com/p/BgqvPauhRzs/?https://www.instagram.com/p/B-AF0gxHyEk/?

--- By animationhttps://www.instagram.com/p/BxT8OgrH1Pl/?https://www.instagram.com/p/B9zWljtHaDN/?


Area of Triangles --- proofby animationhttps://www.instagram.com/p/Bg1WiBAhJXW/?
by cutting paperhttps://www.instagram.com/p/Bg5flQ7hGvc/?

Finding Area

https://www.instagram.com/p/CYCW0WbBSzY/https://www.instagram.com/p/CYCQTUvPLdE/https://www.instagram.com/p/CYCW0WbBSzY/


Exploratory activity for Areahttps://www.instagram.com/p/BuUEoH8n91X/?

Trigohttps://www.instagram.com/p/CX-QawFpCaO/https://www.instagram.com/p/CX-ZUjIptYN/


Geometry

Vertically opposite angleshttps://www.instagram.com/p/BnlpCmZB5Nu/?

Breath in and out Polygon --- https://www.instagram.com/p/CX5cYfzKfJf/ 
Properaties of Interior and exterior angles of triangleshttps://www.instagram.com/p/BxaWohiHasP/?

A Classical Geometry question (from PSLE)https://www.instagram.com/tv/CM3yhdxnltf/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA== 


Algebra   Check out this answer-checking mnemonicshttps://www.instagram.com/tv/CKOu8KRnkRT/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA== 

Education related sites

Science IG posts (https://www.instagram.com/changchengliang/)

Electricity


Parallel vs Series configuration --- Observe the brightness of the bulbshttps://www.instagram.com/p/BTbwFwjh1JL/?
Newsworthy IG posts
China vs US squabbles about space ventures ><.  https://www.instagram.com/p/CYDooUEJCNl/Nothing could stop man from killing wife ><.  https://www.instagram.com/p/CYA6FIzpyxp/Guide to 2021's tech buzzwords. https://www.instagram.com/p/CYBAeucJfzp/




Music IG posts

Family Time


Graphics/Background




Graphics/Background IG posts
Looping videos IG posts
National Education (NE)

Construction of National Flag

https://www.instagram.com/p/BXhZsHTlYxI/?




Values
Scouts

Scout Hymn   https://www.instagram.com/p/BfiSiPqhwWU/?

In my dreams I'm going back to Gilwell https://www.instagram.com/p/BfkH8rxhCbh/?


mr chang's classes while at PCS

FOR STAFF ONLY (OUT OF BOUNDS TO STUDENTS)