What is 13.17142714271427142... as a Fraction?

13.17142 equals 131701199990 as a fraction.

How do you turn 13.17142 repeating into a fraction?

Detailed Answer:

Step 1: To convert 13.17142 repeating into a fraction, begin writing this simple equation:

n = 13.17142 (equation 1)

Step 2: Notice that there are 4 digits in the repeating block (7142) and 1 digit in the non-repeating part (1). Multiply both sides by 10⁵ = 100000.

100000 × n = 1317142.7142 (equation 2)

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

100000 × n = 1317142.7142
    10 × n = 13.17142
 99990 × n = 1317011

n = 131701199990 (answer)

13.17142 = 131701199990 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 131701199990 is also equal to 131714199990 when expressed as a mixed number.

The repeating decimal 13.17142 (vinculum notation) has a repeated block length of 4. It is also represented as 13.1714271427142... (ellipsis notation) which equals approximately 13.171427142714271427142 (decimal approximation)(*).

The recurring decimal 13.17142 can be written as a ratio of two integers having 1317011 as the numerator and 99990 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.