What is 12.27142714271427142... as a Fraction?

12.27142 equals 1227029999 as a fraction.

How do you turn 12.27142 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.27142 repeating into a fraction, begin writing this simple equation:

n = 12.27142 (equation 1)

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

100000 × n = 1227142.7142 (equation 2)

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

100000 × n = 1227142.7142
    10 × n = 12.27142
 99990 × n = 1227020

122702099990 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 10 (the GCF - greatest common factor).

n = 122702099990 = 1227020 ÷ 1099990 ÷ 10 = 1227029999. So,

12.27142 = 1227029999 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 1227029999 is also equal to 1227149999 when expressed as a mixed number.

The repeating decimal 12.27142 (vinculum notation) has a repeated block length of 4. It is also represented as 12.2714271427142... (ellipsis notation) which equals approximately 12.271427142714271427142 (decimal approximation)(*).

The recurring decimal 12.27142 can be written as a ratio of two integers having 122702 as the numerator and 9999 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.