## Detailed calculations below:

### Introduction. Fractions

#### A fraction consists of two numbers and a fraction bar: ^{418}/_{390}

#### The number above the bar is the numerator: 418

#### The number below the bar is the denominator: 390

#### The fraction bar means that the two numbers are dividing themselves:

^{418}/_{390} = 418 ÷ 390

#### Divide the numerator by the denominator to get fraction's value:

Value = 418 ÷ 390

### Introduction. Percent

#### 'Percent (%)' means 'out of one hundred':

#### p% = p 'out of one hundred',

#### p% = ^{p}/_{100} = p ÷ 100

### Note:

#### The fraction ^{100}/_{100} = 100 ÷ 100 = 100% = 1

#### Multiply a number by the fraction ^{100}/_{100},

... and its value doesn't change.

## To reduce a fraction, divide both its numerator and denominator by their greatest common factor, GCF.

#### To calculate the greatest common factor, we build the prime factorization of the two numbers.

### Integer numbers prime factorization:

#### Prime Factorization of a number: finding the prime numbers that multiply together to make that number.

#### 418 = 2 × 11 × 19;

418 is not a prime, is a composite number;

#### 390 = 2 × 3 × 5 × 13;

390 is not a prime, is a composite number;

** Positive integers that are only dividing by themselves and 1 are called prime numbers. A prime number has only two factors: 1 and itself. *

* A composite number is a positive integer that has at least one factor (divisor) other than 1 and itself.

### Calculate the greatest (highest) common factor (divisor), gcf, hcf, gcd:

#### Multiply all the common prime factors, by the lowest exponents (if any).

#### gcf, hcf, gcd (418; 390) = 2

## Rewrite the fraction:

### As a mixed number (mixed fraction):

#### A mixed number (mixed fraction): a whole number and a proper fraction, of the same sign.

#### A proper fraction: numerator smaller than denominator.

#### 209 ÷ 195 = 1 and remainder = 14 =>

#### 209 = 1 × 195 + 14 =>

^{209}/_{195} =

^{(1 × 195 + 14)} / _{195} =

^{(1 × 195)} / _{195} + ^{14} / _{195} =

#### 1 + ^{14}/_{195} =

#### 1 ^{14}/_{195}

### As a decimal number:

#### 1 ^{14}/_{195} =

#### 1 + ^{14}/_{195} =

#### 1 + 14 ÷ 195 ≈

#### 1.071794871795 ≈

#### 1.07

### As a percentage:

#### 1.071794871795 =

#### 1.071794871795 × ^{100}/_{100} =

#### ^{107.179487179487}/_{100} =

#### 107.179487179487% ≈

#### 107.18%

#### In other words:

#### 1) Calculate fraction's value.

#### 2) Multiply that number by 100.

#### 3) Add the percent sign % to it.

## Final answer

continued below...