估算答案（9岁以上）
Estimating answers (age 9+)
在现实世界和数学问题中，应用长方形（包括正方形）的面积公式（长×宽）和周长公式（2×长+2×宽）；使用标准单位（平方厘米、平方米）计算和比较面积，并估算不规则图形的面积。
Apply the area formula (l × w) and perimeter formula (2l + 2w) for rectangles including squares in real-world and mathematical problems; calculate and compare areas using standard units (cm², m²) and estimate areas of irregular shapes
学习证据 / Evidence
- 已知房间面积为48平方米、长为8米，求房间的宽。
- 计算边长为7.5厘米的正方形的面积。
- 估算画在平方厘米方格纸上的不规则池塘的面积。
- Find the width of a room given area = 48 m² and length = 8 m
- Calculate the area of a square with side 7.5 cm
- Estimate the area of an irregular pond drawn on a cm² grid
评估问题 / Assessment
如果{{name}}想给一间长6.5米、宽4米的房间铺地毯，能算出它的面积吗？还能算出房间四周需要多少米踢脚线吗？
If {{name}} wants to carpet a room 6.5 m × 4 m, can they calculate the area — and also work out how many metres of skirting board are needed around the edge?