CHAPTER 01 · LEARN AT YOUR OWN PACE
Rates and Ratios.
Explore a picture. Understand the method. Build a solution.速率與比：先睇圖理解，再跟住例子一步步學。
Start at 01, or choose the topic you need. You can open every explanation without passing a quiz.建議由 01 開始。冇計時、冇計分，唔識做都可以直接睇解說。
Rates 速率
2 lessonsRatios 比
6 lessonsRatios & simplest form
比與最簡整數比
Keep ratio order, use the same units, and simplify decimal or fractional ratios.
Ratio equations
比例方程
Understand fraction order and why cross multiplication works.
Ratios with algebra
含代數式的比例方程
Solve a ratio equation with brackets, and find a ratio from an algebraic equation.
Sharing in a ratio
按比以總數或相差分配
Use a shared k to divide a total or a difference between two or three quantities.
Combining three quantities
合併兩個比成三項比
Match the common quantity, then combine two ratios without changing their relationships.
Ratios of expressions
代數式的比
Match the common variable, use one k, then compare expressions.
Scale drawings 比例尺
2 lessonsMaps & scale drawings
地圖與比例尺
Read drawing:actual scales, convert units, and handle reductions or enlargements.
Scale drawings & area
比例尺、面積與每平方米費用
Convert a scale drawing to actual dimensions, find area, then calculate a rate per square metre.
Connect the methods and revisit the ideas you want to explain more clearly.
Open the chapter recap →