What is 12.3428428428... as a Fraction?

12.3428 equals 246611998 as a fraction.

How do you turn 12.3428 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.3428 repeating into a fraction, begin writing this simple equation:

n = 12.3428 (equation 1)

Step 2: Notice that there are 3 digits in the repeating block (428) and 1 digit in the non-repeating part (3). Multiply both sides by 10⁴ = 10000.

10000 × n = 123428.428 (equation 2)

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

10000 × n = 123428.428
   10 × n = 12.3428
 9990 × n = 123305

1233059990 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 5 (the GCF - greatest common factor).

n = 1233059990 = 123305 ÷ 59990 ÷ 5 = 246611998. So,

12.3428 = 246611998 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 246611998 is also equal to 126851998 when expressed as a mixed number.

The repeating decimal 12.3428 (vinculum notation) has a repeated block length of 3. It is also represented as 12.3428428428... (ellipsis notation) which equals approximately 12.3428428428428428 (decimal approximation)(*).

The recurring decimal 12.3428 can be written as a ratio of two integers having 24661 as the numerator and 1998 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.