What is 20.1111111... as a Fraction?

20.111 equals 1819 as a fraction.

How do you turn 20.111 repeating into a fraction?

Detailed Answer:

Step 1: To convert 20.111 repeating into a fraction, begin writing this simple equation:

n = 20.111 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (1) and 2 digits in the non-repeating part (11). Multiply both sides by 10³ = 1000.

1000 × n = 20111.1 (equation 2)

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

1000 × n = 20111.1
 100 × n = 20.111
 900 × n = 18100

18100900 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 100 (the GCF - greatest common factor).

n = 18100900 = 18100 ÷ 100900 ÷ 100 = 1819. So,

20.111 = 1819 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 1819 is also equal to 2019 when expressed as a mixed number.

The repeating decimal 20.111 (vinculum notation) has a repeated block length of 1. It is also represented as 20.11111... (ellipsis notation) which equals approximately 20.1111111 (decimal approximation)(*).

The recurring decimal 20.111 can be written as a ratio of two integers having 181 as the numerator and 9 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.