Which of the following represents the tenths place in the decimal 0.45?

In the decimal representation 0.45, each digit has a specific place value. The tenths place is the first digit to the right of the decimal point. In 0.45, the first digit after the decimal point is 4, which is located in the tenths place. Therefore, 4 represents four-tenths or 0.4.

The correct answer highlights the importance of understanding decimal place values, where the tenths place immediately follows the decimal point and indicates one part out of ten. This foundational knowledge is essential when working with decimals in various mathematical contexts.