Chang's Math blog

Compilation of math questions by pupils

Tuesday, August 26, 2025

Why a circle is broken into 360 degrees?


Why a circle has 360 degrees 😎 interesting ✅ Source: Longjumping-Box5691
Damn Thats Interesting (@dam.thats.interesting) on Threads
threads.com


https://www.threads.com/@dam.thats.interesting/post/DNxBhm30nIU?xmt=AQF0AokJR_FakrGYGxXVDbZTy6vLUHXgGDwhIgQZUia3Jw&slof=1

Sent from my iPhone
Posted by ChangCL's Site at 10:09 AM
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Monday, August 25, 2025

P5 volume / capacity

Posted by ChangCL's Site at 1:16 AM
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Wednesday, August 20, 2025

simultaneous equations

5 + 5x2 =15
Chang Cheng Liang (@changchengliang) on Threads
threads.com


https://www.threads.com/@changchengliang/post/DNivP2jhp-m?xmt=AQF0BIAeiP1uc_WMuR5GpJELgblfzpJnyCUwA5qrE_HvHg


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Posted by ChangCL's Site at 12:12 AM
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Tuesday, August 12, 2025

SG60 commemorative WS— p6 circles, geometry, measurements

Posted by ChangCL's Site at 6:41 PM
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Saturday, August 9, 2025

Tribute to Singapore and in commemoration of SG60


The black and white version...



Posted by ChangCL's Site at 12:01 PM
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A Möbius Strip structure 🤗


https://www.threads.com/@theacidmind/post/DNF9nPVOwTJ?xmt=AQF016uE-2Nz9xVvCdudstV4YyiFbfZCcseZWnn7b6FbDQ

🤯🤯🤯 | Track ID: sabrj - photosynthesis
T.A.M.R | The Acid Mind Recordings (@theacidmind) on Threads
threads.com


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Posted by ChangCL's Site at 10:14 AM
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Friday, August 8, 2025

PSLE questions by topics (2009-2013)

https://drive.google.com/drive/folders/16HcJf7VWFqlnNWh6TTrtOB1mrFlPUbHd?usp=drive_link

Posted by ChangCL's Site at 11:12 PM
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Sunday, August 3, 2025

The 7 Deadly Sins of Mathematics

https://www.instagram.com/reel/DM200jQNnEg/?igsh=aXhkNjBwM2pycmVx.
Math Animations on Instagram: "Indeterminate forms are expressions that arise when evaluating limits but do not have a clear or predictable value on their own. They often occur in calculus, especially when dealing with functions that approach infinity, zero, or both. An indeterminate form signals that the situation is more complex than it appears and that standard arithmetic rules cannot be directly applied. For example, when both the numerator and the denominator of a fraction approach zero, the result is not automatically zero or any specific value. Instead, we say the expression takes the indeterminate form „zero over zero," and further analysis, such as using algebraic simplification or L'Hôpital's Rule, is needed to find the actual limit. Other common indeterminate forms include expressions like infinity divided by infinity, zero times infinity, or one raised to the power of infinity. These forms are called "indeterminate" because they can lead to many different outcomes dependin
instagram.com

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Posted by ChangCL's Site at 7:39 AM
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Saturday, August 2, 2025

Geometry Rule— Isosceles Triangle drill —- the yellow Angry Bird

When you encounter an isosceles, do the Angry-bird drill 

Posted by ChangCL's Site at 11:32 PM
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Golden Ratio — pleasing proportion found in nature

THE GRAPHER on Instagram: "Do we try to fit the golden ratio everywhere or is it everywhere? . Post illustration by @sketchplanations"
instagram.com


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Posted by ChangCL's Site at 8:01 PM
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6 Important Geometry Theorems

Jude MahiBlan (@heyasianjude) on Threads
threads.com


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Posted by ChangCL's Site at 11:33 AM
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Wednesday, July 30, 2025

Appreciating square roots

Fermat's Library on Instagram: "Square Roots"
instagram.com


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%Percentage —— did u know 🤗

Posted by ChangCL's Site at 12:39 PM
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Tuesday, July 29, 2025

The percentage sign % (morphing of)

https://youtu.be/AmAsFs_aYOU?si=dju0K7V4gJs64Fjt

Posted by ChangCL's Site at 1:06 AM
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Monday, July 28, 2025

Bird-fishing

老鷹🦅能不能吃河豚🐡
Snow (@snow20010416) on Threads
threads.com


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Posted by ChangCL's Site at 10:37 AM
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A dancing mathematician

This is another of my favourite! dancing mathematician
dancing mathematician
g.co


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Posted by ChangCL's Site at 8:59 AM
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Saturday, July 26, 2025

The Chain Rule!

alevelmaths on Instagram: "Differentiation | What is the Chain Rule? 🎓 The following video is a demonstration on why the Chain Rule is useful in differentiation and how it can be used 🧐 #Calculus #differentiation #alevelmaths #calculusab #chainrule"
instagram.com


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Posted by ChangCL's Site at 6:43 PM
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Introducing square numbers

Look at this GIF... 👀 
Found a gif I want you to see!
pin.it

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Posted by ChangCL's Site at 12:43 PM
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Wednesday, July 23, 2025

*My Year 2026 Clock*

1 = -(2+0!+2-6)=1
2 = -(2+0+2-6)=2
3 = (20-2)/6=3
4 = -2^0*(2-6)=4
5 = -20/(2-6)=5
6 = 2*0*2+6=6
7 = (2-0)/2+6=7
8 = 2+0*2+6=8
9 = 2-0!+2+6=9
10 = 2+0+2+6=10
11 = 2+0!+2+6=11
12 = 2*0+2*6=12

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Posted by ChangCL's Site at 6:35 PM
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How to do partial fractions

Neil Trivedi | MyEdSpace on Instagram: "NEVER Get Stuck On Algebraic Fractions Again - Use The BIG TOE Method 👣 [Algebraic Fractions Simplified, How To Solve Algebraic Fractions, Maths Tricks For Algebra, Algebra Made Easy, GCSE Algebra Help, Big Toe Method Maths, Funny Maths Trick, NeilDoesMaths, MyEdSpace]"
instagram.com


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Posted by ChangCL's Site at 4:47 PM
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Tuesday, July 22, 2025

What is the closest time to midnight

Posted by ChangCL's Site at 8:36 AM
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Saturday, July 19, 2025

why it is mathematically impossible to tune a piano

Howie Hua on Instagram: "It's mathematically impossible to perfectly tune a piano. Here's why. #math #mathematics #maths #mathteacher #mathtricks #mathtrick #piano #stem"
instagram.com


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Posted by ChangCL's Site at 11:34 PM
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Very interesting math animations!

我從3個i之後就看不懂了😂😅😂 雖然但是,還是覺得好好看😍🥰😎
Vincent Memos (@vince.memos) on Threads
threads.com


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Posted by ChangCL's Site at 8:53 AM
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Thursday, July 17, 2025

Number system chart

Radha Singh ♡ Math Enthusiast on Instagram: "Number System Chart 📈 ✳ Tag Your Friends ✳ •Have a awesome day 💐 ________________________________________ 🎯 Basic to advance mathematics 📚 👉 Thank you so much for hit like ❤ 👉 Drop your comment in the comment section. ________________________________________ Visit our Profile for more 👉 @mathcivilians and @civilrealisticworld 🙏 ________________________________________ 👥 Share this with your friends in story 📌 Save it for future references 📢 Tag someone who need to see this. ________________________________________ . .. ... #math #mathslover #mathematics #mathsteacher #mathexam #maths #mathematician #mathproblems #mathstricks #mathstudents #mathnotes #studymemes #mathisbeautiful #mathcivilians #civilrealisticworld #mathclass #trigonometry #physics #engineering #trending #geometry #ssc #railway #bank #jee #upsc #iitian #reet #neetpreparation #numbersystem . .. ... @shank0110 @gaurav2817singh @civilrealisticworld"
instagram.com


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Posted by ChangCL's Site at 12:42 PM
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Wednesday, July 16, 2025

A Pythagorean Shell 🤗

Take a look! 📌 
Found this on Pinterest
pin.it

Sent from my iPhone
Posted by ChangCL's Site at 11:21 AM
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