What is 18.180101... as a Fraction?

18.1801 equals 1799839900 as a fraction.

How do you turn 18.1801 repeating into a fraction?

Detailed Answer:

Step 1: To convert 18.1801 repeating into a fraction, begin writing this simple equation:

n = 18.1801 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (01) and 2 digits in the non-repeating part (18). Multiply both sides by 10⁴ = 10000.

10000 × n = 181801.01 (equation 2)

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

10000 × n = 181801.01
  100 × n = 18.1801
 9900 × n = 179983

n = 1799839900 (answer)

18.1801 = 1799839900 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 1799839900 is also equal to 1817839900 when expressed as a mixed number.

The repeating decimal 18.1801 (vinculum notation) has a repeated block length of 2. It is also represented as 18.18010101... (ellipsis notation) which equals approximately 18.180101010101 (decimal approximation)(*).

The recurring decimal 18.1801 can be written as a ratio of two integers having 179983 as the numerator and 9900 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.