What is 17.621212121... as a Fraction?

17.621 equals 116366 as a fraction.

How do you turn 17.621 repeating into a fraction?

Detailed Answer:

Step 1: To convert 17.621 repeating into a fraction, begin writing this simple equation:

n = 17.621 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (21) and 1 digit in the non-repeating part (6). Multiply both sides by 10³ = 1000.

1000 × n = 17621.21 (equation 2)

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

1000 × n = 17621.21
  10 × n = 17.621
 990 × n = 17445

17445990 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 15 (the GCF - greatest common factor).

n = 17445990 = 17445 ÷ 15990 ÷ 15 = 116366. So,

17.621 = 116366 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 116366 is also equal to 174166 when expressed as a mixed number.

The repeating decimal 17.621 (vinculum notation) has a repeated block length of 2. It is also represented as 17.6212121... (ellipsis notation) which equals approximately 17.62121212121 (decimal approximation)(*).

The recurring decimal 17.621 can be written as a ratio of two integers having 1163 as the numerator and 66 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.