## Convert the integer number 81.

### 1. Write the number as an improper fraction.

#### (The numerator larger than or equal to the denominator).

#### 81 can be written as a fraction.

#### The numerator of this fraction is 81.

#### / is the fraction bar.

#### The denominator is 1:

#### 81 = ^{81}/_{1}

### Equivalent fractions.

#### The above fraction cannot be reduced.

#### That is, it has the smallest numerator and denominator possible.

#### By expanding it we can build up equivalent fractions.

#### (Multiply the numerator & the denominator by the same number).

#### Example 1. By expanding the fraction by 4:

^{81}/_{1} = ^{(81 × 4)}/_{(1 × 4)} = ^{324}/_{4}

#### Example 2. By expanding the fraction by 7:

^{81}/_{1} = ^{(81 × 7)}/_{(1 × 7)} = ^{567}/_{7}

#### Of course, the above fractions are reducing...

#### ... to the initial fraction: ^{81}/_{1}

### 2. Write the number as a percentage.

#### Note: ^{100}/_{100} = 1

#### 81 =

#### 81 × ^{100}/_{100} =

^{(81 × 100)}/_{100} =

#### ^{8,100}/_{100} =

#### 8,100%

#### In other words:

#### Multiply the number by 100...

#### ... And then add the percent sign, %

#### 81 = 8,100%