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


Sent from my iPhone
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


Sent from my iPhone
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


Sent from my iPhone
Posted by ChangCL's Site at 11:33 AM
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      • Why a circle is broken into 360 degrees?
      • P5 volume / capacity
      • simultaneous equations
      • SG60 commemorative WS— p6 circles, geometry, measu...
      • Tribute to Singapore and in commemoration of SG60
      • A Möbius Strip structure 🤗
      • PSLE questions by topics (2009-2013)
      • The 7 Deadly Sins of Mathematics
      • Geometry Rule— Isosceles Triangle drill —- the yel...
      • Golden Ratio — pleasing proportion found in nature
      • 6 Important Geometry Theorems
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