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:
Written with exponents:
1,602 = 2 × 3 × 3 × 89 = 2 × 32 × 89
1,602 is a composite number.
Written with exponents:
12,000 = 2 × 2 × 2 × 2 × 2 × 3 × 5 × 5 × 5 = 25 × 3 × 53
12,000 is a composite number.
1,602/12,000 =
(1,602 ÷ 6) / (12,000 ÷ 6) =
267/2,000
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.
1,602/12,000 =
(2 × 32 × 89)/(25 × 3 × 53) =
((2 × 32 × 89) ÷ (2 × 3)) / ((25 × 3 × 53) ÷ (2 × 3)) =
(3 × 89)/(24 × 53) =
267/2,000
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
267/2,000 =
267 ÷ 2,000 =
0.1335 ≈
0.13