Simplify the Fraction 999,999,999,981/18 by Reducing It to the Lowest Terms, the Simplest Equivalent Form With the Smallest Numerator and Denominator. Online Calculator

Reduce (simplify) the fraction 999,999,999,981/18 to the lowest terms

How To Reduce (Simplify) the Fraction?

  • To completely reduce (simplify) a fraction to its lowest terms, divide the numerator and the denominator of the fraction by their greatest common factor, gcf (also called the highest common factor, hcf, or the greatest common divisor, gcd).
  • To calculate the greatest (highest) common factor (divisor), gcf (hcf, gcd), we perform the prime factorization of the two numbers.

The prime factorization of the two numbers

The prime factorization of a number: finding the prime numbers that multiply together to make that number.


999,999,999,981 = 32 × 577 × 192,566,917
999,999,999,981 is not a prime number but a composite one.

18 = 2 × 32
18 is not a prime number but a composite one.




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

Multiply all the common prime factors, taken by their smallest exponents (powers).

gcf, hcf, gcd (999,999,999,981; 18) = 32 = 9

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



Divide the numerator and the denominator of the fraction by their greatest (highest) common factor (divisor), gcf (hcf, gcd).

999,999,999,981/18 =

(32 × 577 × 192,566,917)/(2 × 32) =

((32 × 577 × 192,566,917) ÷ 32) / ((2 × 32) ÷ 32) =

(577 × 192,566,917)/2 =

111,111,111,109/2


The fraction is now completely reduced (simplified) to its lowest terms.

What is a completely reduced (simplified) fraction?

  • A fraction that is completely reduced (simplified) to its lowest terms (to its basic representation, to its simplest form) has the smallest possible numerator and denominator.
  • A fully reduced fraction is called an irreducible fraction and its numerator and denominator are coprime numbers.
  • 111,111,111,109/2 is an improper fraction.
  • An improper fraction: the numerator is greater than or equal to the denominator.

Rewrite the fraction:

As a mixed number (mixed fraction):

  • A mixed number: an integer and a proper fraction that have the same sign.
  • The original improper fraction is obtained by adding the integer number and the proper fraction.
  • A proper fraction: the numerator is smaller than the denominator.

111,111,111,109 ÷ 2 = 55,555,555,554 and Remainder = 1 ⇒

111,111,111,109 = 55,555,555,554 × 2 + 1 ⇒

111,111,111,109/2 =

(55,555,555,554 × 2 + 1) / 2 =

(55,555,555,554 × 2) / 2 + 1 / 2 =

55,555,555,554 + 1/2 =

55,555,555,554 1/2


As a decimal number:

Divide the numerator of the fraction by its denominator.


55,555,555,554 1/2 =

55,555,555,554 + 1/2 =

55,555,555,554 + 1 ÷ 2 =

55,555,555,554.5


As a percentage:

  • Multiply the fraction's value by the fraction 100/100
  • 100/100 = 100 ÷ 100 = 100% = 1
  • Multiply a number by the fraction 100/100,
    ... and its value will not change, only the form.

55,555,555,554.5 =

55,555,555,554.5 × 100/100 =

5,555,555,555,450/100 =

5,555,555,555,450%


The final answer:
:: Written in four ways ::

As an improper fraction:
999,999,999,981/18 = 111,111,111,109/2

As a mixed number (mixed fraction):
999,999,999,981/18 = 55,555,555,554 1/2

As a decimal number:
999,999,999,981/18 = 55,555,555,554.5

As a percentage:
999,999,999,981/18 = 5,555,555,555,450%

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Tutoring: simplifying fractions - reducing them to the lowest terms

Steps to simplify a fraction, to reduce it to its lowest terms:

  • A fraction fully simplified, a fraction reduced to its lowest terms is a fraction that can no longer be simplified, it has been reduced to its simplest equivalent fraction, the one having the smallest numerator and denominator possible - prime to each other.
  • 1) Run the prime factorization of both the numerator and the denominator of the fraction.
  • 2) Calculate the greatest common factor, GCF (or the greatest common divisor, GCD) of the fraction's numerator and denominator.
  • 3) Divide both the numerator and the denominator of the fraction by their greatest common factor, GCF (GCD).
  • The fraction thus obtained is called a reduced fraction or a fraction simplified to its lowest terms.
  • A fraction reduced to its lowest terms may no longer be reduced and it is called an irreducible fraction.

Example: reduce the fraction 315/1,155 as much as possible, simplify it to the lowest terms.

  • 1) Run the prime factorization of both the numerator and the denominator of the fraction.

  • The numerator of the fraction is 315, its breaking down into prime factors is:
    315 = 3 × 3 × 5 × 7 = 32 × 5 × 7
  • The denominator of the fraction is 1,155, its breaking down into prime factors is:
    1,155 = 3 × 5 × 7 × 11.

  • 2) Calculate the greatest common factor, GCF (or the greatest common divisor, GCD) of the fraction's numerator and denominator.

  • The greatest common factor, gcf (315; 1,155), is calculated by multiplying all the common prime factors of the numerator and the denominator, taken by their lowest powers (their lowest exponents):
  • GCF (315; 1,155) = (32 × 5 × 7; 3 × 5 × 7 × 11) = 3 × 5 × 7 = 105

  • 3) Divide both the numerator and the denominator of the fraction by their greatest common factor, GCF (GCD).

  • The numerator and denominator of the fraction are divided by their greatest common factor, GCF:
  • 315/1,155 =
    (32 × 5 × 7)/(3 × 5 × 7 × 11) =
    ((32 × 5 × 7) ÷ (3 × 5 × 7)) / ((3 × 5 × 7 × 11) ÷ (3 × 5 × 7)) =
    3/11
  • The fraction thus obtained is called a fraction reduced to the lowest terms.

Why reducing (simplifying) fractions to lower terms?

  • When running operations with fractions we are often required to bring them to the same denominator, for example when adding, subtracting or comparing.
  • Sometimes both the numerators and the denominators of those fractions are large numbers and doing calculations with such numbers could be difficult.
  • By reducing (simplifying) a fraction, both its numerator and denominator are reduced to smaller values, much easier to work with, which will decrease the overall effort of working with that fraction.

Read the entire article ⇒ Completely reduce (simplify) fractions to the lowest terms: Steps and Examples