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:
Written with exponents:
68 = 2 × 2 × 17 = 22 × 17
68 is a composite number.
500,000,086 = 2 × 19 × 107 × 122,971
500,000,086 is a composite number.
68/500,000,086 =
(68 ÷ 2) / (500,000,086 ÷ 2) =
34/250,000,043
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.
68/500,000,086 =
(22 × 17)/(2 × 19 × 107 × 122,971) =
((22 × 17) ÷ 2) / ((2 × 19 × 107 × 122,971) ÷ 2) =
(2 × 17)/(19 × 107 × 122,971) =
34/250,000,043
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
34/250,000,043 =
34 ÷ 250,000,043 =
0.000000136 ≈
0