13.45用英语怎么说

"13.45" in English is "thirteen point forty-five."

This notation for expressing decimal numbers comes from the use of a decimal point (a dot or period) to separate the whole number part of a number from the fractional part. The whole number is written to the left of the decimal point, while the fractional part is written to the right of the decimal point and represents a multiple of 1/10, 1/100, 1/1000, etc.

Examples:

"The price of the car is thirteen point forty-five thousand dollars." (价格是13.45万美元)
"The temperature is thirteen point forty-five degrees Celsius." (温度是13.45摄氏度)
"The coordinates of the location are thirteen point forty-five degrees latitude and fifty-two point thirty-seven degrees longitude." (坐标是13.45纬度和52.37经度)