0到1概率标尺

理解概率是一种度量，用0（不可能）到1（一定发生）之间的数来表示；能把事件放在概率标尺上；能用分数、小数和百分数表示概率。

Understand probability as a measure expressed as a number between 0 (impossible) and 1 (certain); place events on the probability scale; express probabilities as fractions, decimals, and percentages

学习证据 / Evidence

• 在从0（不可能）到1（一定发生）的数轴上标出事件的位置，并用分数或小数表示该位置。
• 解释概率0.5表示“机会均等”，并将其与日常用语“很可能”联系起来。
• 能在日常用语（如“非常不可能”）和0到1标尺上的数值位置之间进行转换。

• Place events on a number line from 0 (impossible) to 1 (certain), expressing positions as fractions or decimals
• Explain that a probability of 0.5 means 'even chance' and connect this to the informal word 'likely'
• Convert between informal language ('very unlikely') and a numerical position on the 0-to-1 scale

评估问题 / Assessment

{{name}}能把同一个概率分别写成分数、小数和百分数吗——例如知道“机会均等”就是½、0.5和50%？

Can {{name}} write the same probability as a fraction, a decimal, and a percentage — for example, knowing that an even chance is ½, 0.5, and 50%?