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:
6,153,846 = 2 × 3 × 1,025,641
6,153,846 is a composite number.
Written with exponents:
20,000,000 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5 × 5 × 5 × 5 = 28 × 57
20,000,000 is a composite number.
6,153,846/20,000,000 =
(6,153,846 ÷ 2) / (20,000,000 ÷ 2) =
3,076,923/10,000,000
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.
6,153,846/20,000,000 =
(2 × 3 × 1,025,641)/(28 × 57) =
((2 × 3 × 1,025,641) ÷ 2) / ((28 × 57) ÷ 2) =
(3 × 1,025,641)/(27 × 57) =
3,076,923/10,000,000
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
3,076,923/10,000,000 =
3,076,923 ÷ 10,000,000 =
0.3076923 ≈
0.31