# What Is An Exact Number In Math?

An exact number is a value that is known with complete certainty. Examples of exact numbers are counted numbers of objects or certain unit conversions. For example …

## Which is an example of an exact number?

Exact Numbers. Exact numbers are either defined numbers or the result of a count. For example, a dozen is defined as 12 objects, and a pound is defined as 16 ounces. An exact number can only be expressed in one way and cannot be simplified any further. Exact numbers have an infinite number of significant figures, but they often appear as integers.

## How is an exact number different from a counted number?

An exact number is considered to have an infinite number of significant figures. It does not limit the number of significant figures in a calculation. It does not contribute to uncertainty in a calculation. While counted numbers are exact, any measured value contains inherent uncertainty.

## Which is an example of an approximate number?

One way to think of approximate numbers is as numbers that arise through measurement or calculation. An exact number on the other hand, can be thought of as one that arises from counting. For example, there are 4 clovers on a four-leaf clover. 4 is an exact number. If the leaf of a four-leaf clover measured 7 cm, the 7 cm is an approximate number.

## What's the difference between an exact number and a sqrt?

Exact number gives it's real value correctly without any rounding or without truncating any digits. For example 23, 200, -56, 0, 0.73, 22/7, 1/3, 3.143 , sqrt (2) are all exact numbers. 1/7=0.143 we are considering that the right hand side number is the approximate value of its respective number on left hand side.

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