This page introduces approximation of a number to a given degree of approximation. The same is also referred as estimation for measurement of an object.

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The word "accurate" means:

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accurate

The word "approximate" means:

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approximate

The accurate length of the pencil in the figure is `73`mm.

Let us consider a scale that does not have graduated marks for millimeters. Using the scale, the accurate length cannot be measured. The approximate length of the pencil in the figure is `7` centimeter. Note that the value `7` is closer to the accurate length.

The accurate length of the pencil in the figure is `78`mm.

Considering the scale with only centimeter marks, the approximate length of the pencil is measured as `8` centimeter. Note that the value `8` is closer to the accurate length.

In many applications, the value of measurement or count need not be accurate. It can be approximated to the nearest value to some degree.

The degree of approximation is explained as follows

• `3842` approximated to nearest `10` is `3840`. The degree of approximation is to the nearest `10`.

• `3842` approximated to nearest `100` is `3800`. The degree of approximation is to the nearest `100`.

• `3842` approximated to nearest `1000` is `4000`. The degree of approximation is to the nearest `1000`.

The word "degree" means amount or level to which something is present. Degree of approximation is the level to which something is approximated.

The word "estimation" means: approximation and rough calculation to the nearest value. The estimation of a count or measure is the approximate value of the count or measure.

*familiarize with the terminology *

estimation

*Solved Exercise Problem: *

What is the approximate value of `3428` to the nearest `100`?

- `3400`
- `3400`
- `34`
- `3500`
- `400`

The answer is "`3400`"

**Approximation of numbers** : A number may be approximated or rounded to the nearest `10`, or `100`, or `1000`, etc. If the number is halfway or above, then it is approximated to the higher value. If not, then it is approximated to the lower value.

*Solved Exercise Problem: *

Estimate the value of `428` to the nearest `10`?

- `420`
- `42`
- `430`
- `430`
- `30`

The answer is "`430`"

*Solved Exercise Problem: *

What is the approximate value of `3450` to the nearest `100`?

- `3400`
- `3500`
- `3500`
- cannot be approximated

The answer is "`3500`"

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