What is 13.138571857185718571... as a Fraction?

13.138571 equals 2189543166650 as a fraction.

How do you turn 13.138571 repeating into a fraction?

Detailed Answer:

Step 1: To convert 13.138571 repeating into a fraction, begin writing this simple equation:

n = 13.138571 (equation 1)

Step 2: Notice that there are 4 digits in the repeating block (8571) and 2 digits in the non-repeating part (13). Multiply both sides by 10⁶ = 1000000.

1000000 × n = 13138571.8571 (equation 2)

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

1000000 × n = 13138571.8571
    100 × n = 13.138571
 999900 × n = 13137258

13137258999900 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 6 (the GCF - greatest common factor).

n = 13137258999900 = 13137258 ÷ 6999900 ÷ 6 = 2189543166650. So,

13.138571 = 2189543166650 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 2189543166650 is also equal to 1323093166650 when expressed as a mixed number.

The repeating decimal 13.138571 (vinculum notation) has a repeated block length of 4. It is also represented as 13.13857185718571... (ellipsis notation) which equals approximately 13.1385718571857185718571 (decimal approximation)(*).

The recurring decimal 13.138571 can be written as a ratio of two integers having 2189543 as the numerator and 166650 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.