Chang's Math blog
Compilation of math questions by pupils
Thursday, September 4, 2025
Wednesday, September 3, 2025
Well-intended advice for tackling TFNPTT questions (True, False, Not Possible to Tell)
Well-intended Advice:
● For True statements, circle the facts from your observation or calculation to justify
● For False statements, circle the non-facts and
○ State what the facts ought to be or
○ Cite numerical inconsistencies that doomed the statement to falsehood. (eg. when certain numbers have to be odd, or say multiples of 3 etc, as dictated by certain ratios as stated in the question, and yet are inconsistent)
● For Not Possible to Tell (NPTT) statements, circle the ambiguous word/clause and cite other possibilities to satisfy the claim of the statement.*
*Usually statements that are deemed NPTT can have more than one possibility. It is flagged out as "not possible to tell" as there is not enough information to confirm the statement to be True or False.
Tuesday, September 2, 2025
Monday, September 1, 2025
Tuesday, August 26, 2025
Why a circle is broken into 360 degrees?
Monday, August 25, 2025
Wednesday, August 20, 2025
simultaneous equations
Tuesday, August 12, 2025
Saturday, August 9, 2025
A MΓΆbius Strip structure π€
Friday, August 8, 2025
Sunday, August 3, 2025
The 7 Deadly Sins of Mathematics
Saturday, August 2, 2025
Geometry Rule— Isosceles Triangle drill —- the yellow Angry Bird
Golden Ratio — pleasing proportion found in nature
Wednesday, July 30, 2025
Tuesday, July 29, 2025
Monday, July 28, 2025
Saturday, July 26, 2025
Wednesday, July 23, 2025
*My Year 2026 Clock*
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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