What is 12.8121212... as a Fraction?

12.812 equals 2114165 as a fraction.

How do you turn 12.812 repeating into a fraction?

Detailed Answer:

Step 1: To convert 12.812 repeating into a fraction, begin writing this simple equation:

n = 12.812 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (12) and 1 digit in the non-repeating part (8). Multiply both sides by 10³ = 1000.

1000 × n = 12812.12 (equation 2)

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

1000 × n = 12812.12
  10 × n = 12.812
 990 × n = 12684

12684990 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 = 12684990 = 12684 ÷ 6990 ÷ 6 = 2114165. So,

12.812 = 2114165 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 2114165 is also equal to 12134165 when expressed as a mixed number.

The repeating decimal 12.812 (vinculum notation) has a repeated block length of 2. It is also represented as 12.8121212... (ellipsis notation) which equals approximately 12.81212121212 (decimal approximation)(*).

The recurring decimal 12.812 can be written as a ratio of two integers having 2114 as the numerator and 165 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.