Mathematics
Measurement
Procedural
8–9 yrs
Area of compound shapes
复合图形的面积
Description
Recognise area as additive; find areas of rectilinear figures by decomposing into non-overlapping rectangles and summing their areas
Mastery Evidence
- Decompose an L-shape into two rectangles, find each area, and add them
- Find the area of a floor plan shaped like a T by splitting into rectangles
- Solve: A room is L-shaped (3m×5m plus 2m×4m) — what is the total area?
Assessment Prompt
If your child is given an L-shaped room on squared paper, can they split it into two rectangles, find the area of each part, and add them to get the total area?
Prerequisites 1
Understanding angles (age 8+)
必须先求出矩形面积，再将多边形图形分解为若干矩形
Unlocks 1
Perimeter of Compound Shapes
