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:
10,916 = 2 × 2 × 2,729 = 22 × 2,729
10,916 is a composite number.
Written with exponents:
40,000 = 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5 = 26 × 54
40,000 is a composite number.
10,916/40,000 =
(10,916 ÷ 4) / (40,000 ÷ 4) =
2,729/10,000
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.
10,916/40,000 =
(22 × 2,729)/(26 × 54) =
((22 × 2,729) ÷ 22) / ((26 × 54) ÷ 22) =
2,729/(24 × 54) =
2,729/10,000
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
2,729/10,000 =
2,729 ÷ 10,000 =
0.2729 ≈
0.27