What is 12.107142871428714287142871428... as a Fraction?

12.1071428 equals 605351094999950 as a fraction.

How do you turn 12.1071428 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.1071428 repeating into a fraction, begin writing this simple equation:

n = 12.1071428 (equation 1)

Step 2: Notice that there are 5 digits in the repeating block (71428) and 2 digits in the non-repeating part (10). Multiply both sides by 10⁷ = 10000000.

10000000 × n = 121071428.71428 (equation 2)

Step 3: Now subtract equation 1 from equation 2 to cancel the repeating block (or repetend) out.

10000000 × n = 121071428.71428
     100 × n = 12.1071428
 9999900 × n = 121070218

1210702189999900 could be the answer, but it still can be put in the simplest form, i.e., reduced.

To simplify this fraction, divide the numerator and denominator by 2 (the GCF - greatest common factor).

n = 1210702189999900 = 121070218 ÷ 29999900 ÷ 2 = 605351094999950. So,

12.1071428 = 605351094999950 as the lowest possible fraction.

As the numerator is greater than the denominator, we have an improper fraction, so we can also express it as a mixed number, thus 605351094999950 is also equal to 125357094999950 when expressed as a mixed number.

The repeating decimal 12.1071428 (vinculum notation) has a repeated block length of 5. It is also represented as 12.10714287142871428... (ellipsis notation) which equals approximately 12.107142871428714287142871428 (decimal approximation)(*).

The recurring decimal 12.1071428 can be written as a ratio of two integers having 60535109 as the numerator and 4999950 as the denominator. So, it is a rational number (named after ratio). It can be shown that a number is rational if its decimal representation is repeating or terminating.

(*) At present, there is no single universally accepted notation or phrasing for repeating decimals.