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:
694,445 = 5 × 138,889
694,445 is a composite number.
Written with exponents:
6,250,000 = 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5 × 5 × 5 × 5 × 5 = 24 × 58
6,250,000 is a composite number.
694,445/6,250,000 =
(694,445 ÷ 5) / (6,250,000 ÷ 5) =
138,889/1,250,000
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.
694,445/6,250,000 =
(5 × 138,889)/(24 × 58) =
((5 × 138,889) ÷ 5) / ((24 × 58) ÷ 5) =
138,889/(24 × 57) =
138,889/1,250,000
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
138,889/1,250,000 =
138,889 ÷ 1,250,000 =
0.1111112 ≈
0.11