In the number 23.405, what does the digit '4' represent?

The digit '4' in the number 23.405 represents the value of 4 hundredths. In decimal notation, each place to the right of the decimal point has a specific value based on its position. The digit immediately after the decimal point is in the tenths place, the next digit is in the hundredths place, and the digit that follows that is in the thousandths place.

In this case, the '4' is located in the hundredths place, which indicates that it represents four parts out of one hundred. Thus, the correct interpretation of '4' in the context of the number 23.405 is that it signifies 4 hundredths, or 0.04. Understanding place value is crucial for reading and interpreting decimal numbers accurately.