hundredth

The "hundredth" thing is the one that comes right after the ninety-ninth. Think about a race: if you complete the hundredth lap of a hundred-lap race, you have reached the finish line. It is also an important word in fractions and decimals. If a number is rounded to the hundredths place, it is shown to two decimal places. For example, pi (pi) is about 3.14159, but rounded to the hundredths place, it becomes 3.14. You might also hear about someone celebrating their "hundredth birthday," a remarkable moment that marks a full century of life.

The word "hundredth" describes something connected to the number one hundred. It can show an exact position in a sequence, or it can mean one part out of one hundred equal parts. It is different from the cardinal number "one hundred" because it tells us which one in order we mean, or it names a single part of a larger whole. Imagine a school with 500 students: if you point out the hundredth student to sign up for a fair, you are identifying the person in that exact place on the list.

In mathematics and science, "hundredth" often appears in decimals, measurements, and percentages. When whole numbers are not exact enough, we may measure to the hundredth of a unit. For instance, saying that something is accurate "to the hundredth of an inch" means it is measured to two decimal places, such as 0.05 inches. In the same way, percentages are closely tied to hundredths: saying that 78% of students passed a test is the same as saying that seventy-eight hundredths of the group succeeded.

The word also works as an ordinal number for important moments in time. A "hundredth anniversary," also called a centennial, marks one hundred years since an event took place. This is a rare milestone and is often celebrated in a special way. Whether you are talking about a one-hundredth chance, the hundredth person in line, or the hundredth place in a decimal number, the word always leads back to the idea of one exact part or position in a complete set of one hundred.