What is 12.115714257142571425714257142... as a Fraction?

12.1157142 equals 1211559319999900 as a fraction.

How do you turn 12.1157142 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.1157142 repeating into a fraction, begin writing this simple equation:

n = 12.1157142 (equation 1)

Step 2: Notice that there are 5 digits in the repeating block (57142) and 2 digits in the non-repeating part (11). Multiply both sides by 10⁷ = 10000000.

10000000 × n = 121157142.57142 (equation 2)

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

10000000 × n = 121157142.57142
     100 × n = 12.1157142
 9999900 × n = 121155931

n = 1211559319999900 (answer)

12.1157142 = 1211559319999900 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 1211559319999900 is also equal to 1211571319999900 when expressed as a mixed number.

The repeating decimal 12.1157142 (vinculum notation) has a repeated block length of 5. It is also represented as 12.11571425714257142... (ellipsis notation) which equals approximately 12.115714257142571425714257142 (decimal approximation)(*).

The recurring decimal 12.1157142 can be written as a ratio of two integers having 121155931 as the numerator and 9999900 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.