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

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

#### Integer numbers prime factorization:

#### 9 = 3^{2};

#### 11 is a prime number, it cannot be broken down to other prime factors;

#### Multiply all the common prime factors, by the lowest exponents.

But the two numbers have no common prime factors.

#### gcf, hcf, gcd (9; 11) = 1;

#### coprime numbers (relatively prime);

### Fraction's numerator and denominator are coprime numbers (no common prime factors). Fraction cannot be reduced (simplified) - irreducible.

## Rewrite the fraction:

### As a decimal number:

^{9}/_{11} =

9 ÷ 11 =

0.818181818182 ≈

0.82 ### As a percentage:

0.818181818182 =

0.818181818182 × ^{100}/_{100} =

^{81.818181818182}/_{100} =

81.818181818182% ≈

81.82% ## Final answer:

:: written in three ways ::