To reduce a fraction to the lowest terms equivalent: divide the numerator and denominator by their greatest common factor, GCF
To calculate the greatest common factor, GCF:
- 1. Factor the numerator and the denominator (into prime factors), build their prime factorizations.
- 2. Multiply all their common prime factors, taken by the lowest exponents.
1. Factor the numerator and the denominator:
To factor a number (into prime factors) - or, in other words, to break it down to prime factors - or, in other words, to build its prime factorization: find the prime numbers that multiply together to get that number.
The prime factorizations:
19 is a prime number, it cannot be factored (into other prime factors).
Written with exponents:
4,000,000,004 = 2 × 2 × 7 × 11 × 13 × 19 × 52,579 = 22 × 7 × 11 × 13 × 19 × 52,579
4,000,000,004 is a composite number.
19/4,000,000,004 =
(19 ÷ 19) / (4,000,000,004 ÷ 19) =
1/210,526,316
Yet another method to reduce the fraction
To reduce a fraction without calculating the GCF: factor its numerator and denominator, then all the common prime factors are easily identified and crossed out.
19/4,000,000,004 =
19/(22 × 7 × 11 × 13 × 19 × 52,579) =
(19 ÷ 19) / ((22 × 7 × 11 × 13 × 19 × 52,579) ÷ 19) =
1/(22 × 7 × 11 × 13 × 52,579) =
1/210,526,316
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
1/210,526,316 =
1 ÷ 210,526,316 =
0.00000000475 ≈
0