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:
86 = 2 × 43
86 is a composite number.
Written with exponents:
500,000,080 = 2 × 2 × 2 × 2 × 5 × 97 × 64,433 = 24 × 5 × 97 × 64,433
500,000,080 is a composite number.
86/500,000,080 =
(86 ÷ 2) / (500,000,080 ÷ 2) =
43/250,000,040
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.
86/500,000,080 =
(2 × 43)/(24 × 5 × 97 × 64,433) =
((2 × 43) ÷ 2) / ((24 × 5 × 97 × 64,433) ÷ 2) =
43/(23 × 5 × 97 × 64,433) =
43/250,000,040
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
43/250,000,040 =
43 ÷ 250,000,040 =
0.000000172 ≈
0