公制与英制单位换算
Metric & Imperial Conversion
理解并运用公制单位与常用英制单位（英寸、磅、品脱）之间的近似换算。
Understand and use approximate equivalences between metric units and common imperial units (inches, pounds, pints)
学习证据 / Evidence
- 能说出1英寸约等于2.5厘米，并据此估算以英寸为单位的长度。
- 知道1千克约等于2.2磅，并能估算一个人的体重有多少磅。
- 能在升和品脱之间进行近似换算（1升约合1.75品脱）。
- State that 1 inch ≈ 2.5 cm and use this to estimate length in inches
- Know that 1 kg ≈ 2.2 pounds and estimate a person's weight in pounds
- Convert approximately between litres and pints (1 litre ≈ 1.75 pints)
评估问题 / Assessment
如果{{name}}听说一个婴儿重7磅，他们能不能用所学的近似换算，大致说出这相当于多少公斤？
If {{name}} hears that a baby weighs 7 pounds, can they give a rough idea of that in kilograms — using the approximate conversion they know?