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Key Stage 3 (Junior Secondary)
3.1 Number & Algebra 數與數系
Approximation and Errors 近似與誤差
Rounding Off
Directed Numbers and the Number Line 有向數及數線
dilation pattern in directed number multiplication
Speed Time model for multiplication of directed numbers
有向數加減
有向數加減測驗
Factorization of Simple Polynomials 簡易多項式的因式分解
Factorizing Quadratic Polynomials 因式分解
Formulating Problems with Algebraic Language 以代數語言建立問題
Quiz on n-th term of a Sequence
Triangular Number 三角形數
Identities 恒等式
Difference of Two Squares (1) 平方差公式(一)
Difference of Two Squares (2) 平方差公式(二)
Sum of Two Squares and Perfect Squares 完全平方公式
Linear Equations in Two Unknowns 二元一次方程
Graphing Linear Equations in 2 Unknowns
Simultaneous Linear Equations 聯立二元一次方程
Using Percentages 百分法
Percentages - Selling Problems 百分數 - 買賣問題
Quiz on Fraction to Percentage 分數化百分數
Quiz on Percentage Profit & Loss 盈利/虧蝕百分率
3.2 Measures, Shape & Space 度量、圖形與空間
Angles Related with Lines and Rectilinear Figures 與線及直線圖形有關的角
Angle Sum / Exterior Angles of Triangles
Exterior Angles of Polygons 多邊形的外角和
多邊形內角和
多邊形內角和
多邊形外角和
Congruence and Similarity 全等及相似
Ambiguity of SSA
Ambiguity of SSA
Congruent Triangles 1
Congruent Triangles 2
Congruent Triangles 3
Congruent Triangles 4
Congruent Triangles 5
Naming Congruent Triangles with Reasons
Coordinates Geometry of Straight Lines 直線的坐標幾何
Calculate slope from co-ordinates
Point of Division
Slope Quiz 斜率測驗
Slopes of Parallel Lines 平行綫的斜率
Slopes of Perpendicular Lines 垂直線的斜率(1)
中點測驗
兩點距離測驗
垂直線的斜率（2）
斜率
斜率（重溫）
Introduction to Coordinates 坐標簡介
極坐標測驗
比較極坐標與直角坐標
直角坐標遊戲（一）
直角坐標遊戲（二）
Introduction to Geometry 幾何簡介
Measurement & Categorization of Angle
Oblique & Isometric Grid
Using Protractor to Measure Angles 以量角器量度角
三角形分類
More about 3-D Figures
Rotational Symmetries of 3-D Figures
1. Rotational Symmetry of Cube
2. Rotational Symmetry of Tetrahedron
3. Rotational Symmetry of Octahedron
4. Rotational Symmetry of Dodecahedron
5. Rotational Symmetry of Icosahedron
More about Areas and Volumes
1.1 Trisecting the Cube into 3 Pyramids
1.2 Volume of Pyramids
1.3 Volume of Pyramids - Chinese Proof
2. Curved Surface Area of Cones
3.1 Volume of Spheres
3.2 Surface Area of Spheres
Pythagoras’ Theorem 畢氏定理
Discovering Pythagoras' Theorem by Area 發現畢氏定理
畢氏定理
Simple Idea of Areas and Volumes 面積和體積的簡單概念
Area of Circles(1) 圓的面積(一)
Area of Circles(2) 圓的面積(二)
Area of Circles(3) 圓的面積(三)
Circumference of Circles 圓周與直徑的關係
Pick's Theorem
Simple Introduction to Deductive Geometry 演繹幾何簡介
Drawing a Circle passes through the 3 Vertices of a Triangle
Drawing Incircle of a Triangle
Inscribing a circle in a triangle
Trigonometric Ratios and Using Trigonometry 三角比和三角的應用
Introduction to Cosine & Tangent
Introduction to Sine
3.3 Data Handling 數據處理
Construction and Interpretation of Simple Diagrams and Graphs 簡單圖表及圖像的製作及闡釋
Cumulative Frequency Polygon 累積頻數多邊形的應用
Drawing Histograms 製作組織圖
From Histograms to Frequency Polygons 由組織圖到頻數多邊形
