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:
54,545,485 = 5 × 19 × 574,163
54,545,485 is a composite number.
Written with exponents:
450,000,000 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 5 × 5 × 5 × 5 × 5 × 5 × 5 = 27 × 32 × 58
450,000,000 is a composite number.
54,545,485/450,000,000 =
(54,545,485 ÷ 5) / (450,000,000 ÷ 5) =
10,909,097/90,000,000
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.
54,545,485/450,000,000 =
(5 × 19 × 574,163)/(27 × 32 × 58) =
((5 × 19 × 574,163) ÷ 5) / ((27 × 32 × 58) ÷ 5) =
(19 × 574,163)/(27 × 32 × 57) =
10,909,097/90,000,000
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
10,909,097/90,000,000 =
10,909,097 ÷ 90,000,000 =
0.121212188889 ≈
0.12