What is 12.4230230230... as a Fraction?

12.4230 equals 620534995 as a fraction.

How do you turn 12.4230 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.4230 repeating into a fraction, begin writing this simple equation:

n = 12.4230 (equation 1)

Step 2: Notice that there are 3 digits in the repeating block (230) and 1 digit in the non-repeating part (4). Multiply both sides by 10⁴ = 10000.

10000 × n = 124230.230 (equation 2)

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

10000 × n = 124230.230
   10 × n = 12.4230
 9990 × n = 124106

1241069990 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 2 (the GCF - greatest common factor).

n = 1241069990 = 124106 ÷ 29990 ÷ 2 = 620534995. So,

12.4230 = 620534995 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 620534995 is also equal to 1221134995 when expressed as a mixed number.

The repeating decimal 12.4230 (vinculum notation) has a repeated block length of 3. It is also represented as 12.4230230230... (ellipsis notation) which equals approximately 12.4230230230230230 (decimal approximation)(*).

The recurring decimal 12.4230 can be written as a ratio of two integers having 62053 as the numerator and 4995 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.