What is 17.21111... as a Fraction?

17.211 equals 154990 as a fraction.

How do you turn 17.211 repeating into a fraction?

Detailed Answer:

Step 1: To convert 17.211 repeating into a fraction, begin writing this simple equation:

n = 17.211 (equation 1)

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

1000 × n = 17211.1 (equation 2)

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

1000 × n = 17211.1
 100 × n = 17.211
 900 × n = 15490

15490900 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 10 (the GCF - greatest common factor).

n = 15490900 = 15490 ÷ 10900 ÷ 10 = 154990. So,

17.211 = 154990 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 154990 is also equal to 171990 when expressed as a mixed number.

The repeating decimal 17.211 (vinculum notation) has a repeated block length of 1. It is also represented as 17.21111... (ellipsis notation) which equals approximately 17.2111111 (decimal approximation)(*).

The recurring decimal 17.211 can be written as a ratio of two integers having 1549 as the numerator and 90 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.