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, January 28, 2026
P5 Area of triangles -- Identifying bases and heights for the three types of triangles
Division of fractions --- KCF
See this Instagram post by @changchengliang
Tuesday, January 27, 2026
Saturday, January 17, 2026
Thursday, January 15, 2026
Wednesday, January 14, 2026
Introduction to P5 Rate
- Intro Rate
- Jingle Bells https://youtu.be/3CWJNqyub3o?si=miDXmbdfTwqEaPqx
Jingle Rate
Dashing to connect
Two different quantities
Do not use the equal sign (=)
It's not appropriate!
Instead we use a line
to relate two quantities
But remember to ensure it is
much longer than the minus sign (-) !
Jingle rate, Jingle rate
Jingle all the way
O what fun it is to ride
on a simple longer line
Sent from my iPhone
Tuesday, January 13, 2026
Sunday, January 11, 2026
Laws of logarithm
Sent from my iPhone
Saturday, January 10, 2026
Thursday, January 8, 2026
Tuesday, December 30, 2025
Monday, December 22, 2025
Monday, December 8, 2025
Saturday, December 6, 2025
How can a square be cut into an equilateral triangle #science #knowledge
Thursday, November 27, 2025
Divisibility Rules of of 1 to 10 (aka testing for multiples of 1 to 10)
Wednesday, November 26, 2025
Sunday, November 23, 2025
How to find remainder
How to find reminder using calculator
1. key in the division statement accordingly and hit "="
2. subtract away the whole number portion from the answer (quotient)
3. multiply the decimal (fractional part of the quotient) by the divisor to get the Remainder
Sent from my iPhone
Wednesday, November 19, 2025
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