What is 8.122828... as a Fraction?

8.1228 equals 201042475 as a fraction.

How do you turn 8.1228 repeating into a fraction?

Detailed Answer:

Step 1: To convert 8.1228 repeating into a fraction, begin writing this simple equation:

n = 8.1228 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (28) and 2 digits in the non-repeating part (12). Multiply both sides by 10⁴ = 10000.

10000 × n = 81228.28 (equation 2)

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

10000 × n = 81228.28
  100 × n = 8.1228
 9900 × n = 80416

804169900 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 4 (the GCF - greatest common factor).

n = 804169900 = 80416 ÷ 49900 ÷ 4 = 201042475. So,

8.1228 = 201042475 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 201042475 is also equal to 83042475 when expressed as a mixed number.

The repeating decimal 8.1228 (vinculum notation) has a repeated block length of 2. It is also represented as 8.12282828... (ellipsis notation) which equals approximately 8.122828282828 (decimal approximation)(*).

The recurring decimal 8.1228 can be written as a ratio of two integers having 20104 as the numerator and 2475 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.