What is 12.9142857142857142857142857142857142857142857... as a Fraction?

12.9142857 equals 45235 as a fraction.

How do you turn 12.9142857 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.9142857 repeating into a fraction, begin writing this simple equation:

n = 12.9142857 (equation 1)

Step 2: Notice that there are 6 digits in the repeating block (142857) and 1 digit in the non-repeating part (9). Multiply both sides by 10⁷ = 10000000.

10000000 × n = 129142857.142857 (equation 2)

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

10000000 × n = 129142857.142857
      10 × n = 12.9142857
 9999990 × n = 129142728

1291427289999990 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 285714 (the GCF - greatest common factor).

n = 1291427289999990 = 129142728 ÷ 2857149999990 ÷ 285714 = 45235. So,

12.9142857 = 45235 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 45235 is also equal to 123235 when expressed as a mixed number.

The repeating decimal 12.9142857 (vinculum notation) has a repeated block length of 6. It is also represented as 12.9142857142857142857... (ellipsis notation) which equals approximately 12.9142857142857142857142857142857 (decimal approximation)(*).

The recurring decimal 12.9142857 can be written as a ratio of two integers having 452 as the numerator and 35 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.