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:
123,725 = 5 × 5 × 7 × 7 × 101 = 52 × 72 × 101
123,725 is a composite number.
Written with exponents:
49 = 7 × 7 = 72
49 is a composite number.
123,725/49 =
(123,725 ÷ 49) / (49 ÷ 49) =
2,525/1 =
2,525
* 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.
123,725/49 =
(52 × 72 × 101)/72 =
((52 × 72 × 101) ÷ 72) / (72 ÷ 72) =
(52 × 101)/1 =
(52 × 101) =
2,525
* 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.
2,525 =
2,525 × 100/100 =
(2,525 × 100)/100 =
252,500/100 =
252,500%
- 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