情境中的负数

在具体情境中解释负数（如温度、海平面、银行余额）；会用正数和负整数顺数与倒数，包括越过零进行计数。

Interpret negative numbers in context (temperature, sea level, bank balance); count forwards and backwards with positive and negative whole numbers, including through zero

学习证据 / Evidence

• 在数轴上标出 −3、−1、0、2、5。
• 气温是 −4°C，上升了 7 度，新的温度是多少？
• 从 3 开始逐个数倒数：3、2、1、0、−1、−2。

• Place –3, –1, 0, 2, 5 on a number line
• The temperature is –4°C and rises by 7 degrees — what is the new temperature?
• Count backwards from 3 in ones: 3, 2, 1, 0, –1, –2

评估问题 / Assessment

如果夜间气温降到 −5°C，白天升到 3°C，{{name}}能把这两个温度都标在数轴上，并说出白天的温度比夜间暖和多少度吗？

If the temperature drops to −5°C overnight and rises to 3°C by day, can {{name}} place both on a number line and say how many degrees warmer the daytime temperature is?