The place value of 0 in 9.0 is the tenths place. In decimal numbers, each digit has a fixed position called its place, and each digit has a value depending on its place called the place value of the digit. The place value of zero (0) is always 0, and it may hold any place in a number, but its value will always be 0. In the number 9.0, the digit 9 is in the units place, and the digit 0 is in the tenths place. Therefore, the place value of 0 in 9.0 is the tenths place.