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:
105 = 3 × 5 × 7
105 is a composite number.
Written with exponents:
4,000,000,080 = 2 × 2 × 2 × 2 × 3 × 5 × 19 × 739 × 1,187 = 24 × 3 × 5 × 19 × 739 × 1,187
4,000,000,080 is a composite number.
105/4,000,000,080 =
(105 ÷ 15) / (4,000,000,080 ÷ 15) =
7/266,666,672
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.
105/4,000,000,080 =
(3 × 5 × 7)/(24 × 3 × 5 × 19 × 739 × 1,187) =
((3 × 5 × 7) ÷ (3 × 5)) / ((24 × 3 × 5 × 19 × 739 × 1,187) ÷ (3 × 5)) =
7/(24 × 19 × 739 × 1,187) =
7/266,666,672
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
7/266,666,672 =
7 ÷ 266,666,672 =
0.00000002625 ≈
0