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

Monday, October 19, 2026

S2 trigonometry

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Posted by ChangCL's Site at 11:38 PM

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p5, p6 percentage

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P6 circles

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Sunday, October 18, 2026

Area H: pythagoras

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Posted by ChangCL's Site at 8:45 PM

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Geometry

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Posted by ChangCL's Site at 7:53 PM

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Area of triangle

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Posted by ChangCL's Site at 7:18 PM

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Symbols for Number types

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Posted by ChangCL's Site at 1:41 AM

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Saturday, October 17, 2026

A nice olympiad exponential … let y=2^x

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Posted by ChangCL's Site at 9:13 PM

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S3, S4 inequality

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Posted by ChangCL's Site at 7:25 PM

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P5, P6 geometry

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Posted by ChangCL's Site at 2:44 PM

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Friday, October 16, 2026

Sec1 area of circle parts H:Similar Triangles

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Posted by ChangCL's Site at 5:12 PM

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Sec2 Area of circle parts H: pythagoras theorem

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Posted by ChangCL's Site at 4:03 PM

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Thursday, October 15, 2026

Sec1 Area of triangle H:similar triangles

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Posted by ChangCL's Site at 5:07 PM

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Sec2 Area of triangle H:pythagorean theorem

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Posted by ChangCL's Site at 3:57 PM

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Wednesday, October 14, 2026

P5, P6 numbers, H: model, algebra, substitution

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Posted by ChangCL's Site at 2:12 PM

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Sec2 . Area of equilateral triangle in a square

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Posted by ChangCL's Site at 1:33 PM

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P5, P6 fraction. H: area diag, , algebra, substitution

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Posted by ChangCL's Site at 1:31 PM

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P5, P6, Rate , H: Algebra

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Posted by ChangCL's Site at 12:36 PM

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P5, P6 numbers, H: model, algebra, substitution

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Posted by ChangCL's Site at 1:49 AM

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Monday, October 12, 2026

Surds

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Posted by ChangCL's Site at 12:09 PM

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area of triangle

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Posted by ChangCL's Site at 3:03 AM

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Saturday, October 10, 2026

Sec2, circles, pythagoras theorem

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Posted by ChangCL's Site at 5:47 PM

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Friday, October 9, 2026

Sec 2,3,4 Simplifying algebraic expressions

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Posted by ChangCL's Site at 1:31 PM

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Sec 2,3,4 Simplifying algebraic expressions

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Posted by ChangCL's Site at 1:29 PM

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Thursday, October 8, 2026

P5Geometry

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Posted by ChangCL's Site at 7:58 AM

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