Chang's Math blog
Compilation of all things math --- questions obtained via students' consultation, related math sites. * Do also check out my EduTech contributions at go.gov.sg/changcl
Wednesday, June 17, 2026
Tuesday, June 16, 2026
P6 circles (PSLE 2023)
My solution (a) perim = 3 x 22/7 x 14 = 132 cm (b) Area = 2 x1/2 x 22/7 x 7x7 + 14x28 = 154 + 392 = 546 cm2 Sent from my iPhone
Monday, June 15, 2026
Application of Geometry— Parallel Parking
https://www.threads.com/@tazuwithdriving/post/DZkOMeaDToA?xmt=AQG0J-SRXO2hoTjBdVU7SY69ZKCWXA9CXuFMhlozzvwlyDKfVKYCzcUqf2OeWtdEadbP362e&slof=1 Sent from my iPhone
where does the number e come from
https://www.facebook.com/share/v/1HmE3FNYhS/?mibextid=wwXIfr Sent from my iPhone
Sunday, June 14, 2026
Saturday, June 13, 2026
Rudimentary (Basic) Algorithms for addition, subtraction, multiplication and division
Rudimentary (Basic) Algorithms for addition, subtraction, multiplication and division Algorithms for addition, subtraction, multiplication and division
Addition
https://www.instagram.com/changchengliang/reel/CdIA6UTJ-u0/
Subtraction
https://www.instagram.com/changchengliang/reel/CdIBCztp5Ox/
Multiplicaiton
https://www.instagram.com/changchengliang/reel/CdIBSLLp95n/
Division