What is 0.20909... as a Fraction?

0.209 equals 23110 as a fraction.

How do you turn 0.209 repeating into a fraction?

Detailed Answer:

Step 1: To convert 0.209 repeating into a fraction, begin writing this simple equation:

n = 0.209 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (09) and 1 digit in the non-repeating part (2). Multiply both sides by 10³ = 1000.

1000 × n = 209.09 (equation 2)

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

1000 × n = 209.09
  10 × n = 0.209
 990 × n = 207

207990 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 9 (the GCF - greatest common factor).

n = 207990 = 207 ÷ 9990 ÷ 9 = 23110. So,

0.209 = 23110 as the lowest possible fraction.

The repeating decimal 0.209 (vinculum notation) has a repeated block length of 2. It is also represented as 0.2090909... (ellipsis notation) which equals approximately 0.20909090909 (decimal approximation)(*).

The recurring decimal 0.209 can be written as a ratio of two integers having 23 as the numerator and 110 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.