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:
9,720 = 2 × 2 × 2 × 3 × 3 × 3 × 3 × 3 × 5 = 23 × 35 × 5
9,720 is a composite number.
6 = 2 × 3
6 is a composite number.
9,720/6 =
(9,720 ÷ 6) / (6 ÷ 6) =
1,620/1 =
1,620
* When it's 1, the denominator of the fraction can be omitted.
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.
9,720/6 =
(23 × 35 × 5)/(2 × 3) =
((23 × 35 × 5) ÷ (2 × 3)) / ((2 × 3) ÷ (2 × 3)) =
(22 × 34 × 5)/1 =
(22 × 34 × 5) =
1,620
* When it's 1, the denominator of the fraction can be omitted.
As a percentage:
- A percentage value p% is equal to the fraction: p/100, for any decimal number p. So, we need to change the form of the number calculated above, to show a denominator of 100.
- To do that, multiply the number by the fraction 100/100.
- The value of the fraction 100/100 = 1, so by multiplying the number by this fraction the result is not changing, only the form.
1,620 =
1,620 × 100/100 =
(1,620 × 100)/100 =
162,000/100 =
162,000%
- In other words:
- (1) Calculate the fraction's value, (2) multiply that number by 100, and (3) add the percent sign % to it.
The final answer:
written in three ways