12.91用英语怎么说

"12.91" is a decimal number that can be read as "twelve point ninety-one" in English. It is read as "十二点九一" in Chinese. The decimal point is used to separate the whole number part from the fractional part of a decimal number. In this case, "12" is the whole number part and "91" is the fractional part.
Here are some examples of how to use this number in sentences:
The price of the item is $12.91.
物品的价格是12.91美元。
The temperature outside is 12.91 degrees Celsius.
外面的温度是12.91摄氏度。
The weight of the package is 12.91 kilograms.
这个包裹的重量是12.91千克。