百分数与分数
Percentages as Fractions
将百分比定义为“每一百份中的份数”；将百分比和百分比变化解释为分数或小数；用百分比表示一个量占另一个量的比例；使用百分比比较数量；处理大于100%的百分比。
Define percentage as 'number of parts per hundred'; interpret percentages and percentage changes as a fraction or a decimal; express one quantity as a percentage of another; compare quantities using percentages; work with percentages greater than 100%
学习证据 / Evidence
- 在百分数、分数和小数之间熟练转换
- 用一个量占另一个量的百分比来表示
- 计算百分比的增加和减少，并解释大于100%的百分比
- Convert fluently between percentages, fractions, and decimals
- Express one quantity as a percentage of another
- Calculate percentage increases and decreases and interpret percentages greater than 100%
评估问题 / Assessment
如果商店说一台电视的价格是原价的130%，{{name}}是否理解这意味着什么——并且能根据原价算出新价格吗？
If a shop says a TV is 130% of its original price, does {{name}} understand what that means — and can they work out the new price from the original?