# Which Number Is More Accurate?

In order to decide which number is more accurate, we must consider the number of digits in each. If the number is a decimal, then it would have more digits. However, if the number is a fraction, then it would have fewer digits.

## Decimal has more digits

The more digits a number has, the closer it is to one whole. That is why, for example, five hundred sixty-seven thousandths seems larger than five hundred sixty-seven thousandths. The difference between the two numbers is not apparent until you add the zeros. This helps ensure that the numbers are equal.

## Decimal has more accuracy

The precision of a number refers to the degree of information contained in the digits. A decimal number is more accurate than a whole number in most cases. The precision of a number is important, because it indicates the closeness of measurements. Precision and accuracy are almost equivalent concepts.

## HIV treatment failures range between 20 percent and 50 percent

HIV treatment failures have two major causes: immunological and virological. According to the World Health Organization (WHO), immunological failure occurs when the CD4+ cell count falls below 250 cells/uL after at least one course of antiretroviral therapy, or when the CD4+ cell count remains below 100 cells/uL over several months. To determine whether patients were at risk for treatment failure, expert nurses evaluated face-to-face interviews and medical records to establish the risk factors for failure. These factors were used to develop a structured questionnaire adapted from the WHO risk assessment tool for HIV treatment failure.

## Rounding to the nearest hundredth

When rounding a number, it is important to make sure the digits come from the same place. For example, if the number is 3.141, round it to the nearest hundredth. This will make the second digit, which is five, be five and the number to the right of it be one. Using a round to the nearest hundredth calculator will confirm the results.

## Exact numbers

Exact numbers are numbers that have no uncertainty. For example, two oranges on a table are equal to 2.000. However, some types of polymers are not exact numbers.

## Inexact numbers

Inexact numbers are the opposite of precise numbers. Exact numbers are defined by definition, so they have no uncertainty. Exact numbers include unit conversions, universal measurement values, and fractions. Examples of exact numbers include the number of apples in a box or the number of pages in a magazine. Exact numbers are also used in scientific calculations, such as volume and mass measurements.