What is 81.10111... as a Fraction?

81.101 equals 72991900 as a fraction.

How do you turn 81.101 repeating into a fraction?

Detailed Answer:

Step 1: To convert 81.101 repeating into a fraction, begin writing this simple equation:

n = 81.101 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (1) and 2 digits in the non-repeating part (10). Multiply both sides by 10³ = 1000.

1000 × n = 81101.1 (equation 2)

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

1000 × n = 81101.1
 100 × n = 81.101
 900 × n = 72991

n = 72991900 (answer)

81.101 = 72991900 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 72991900 is also equal to 8191900 when expressed as a mixed number.

The repeating decimal 81.101 (vinculum notation) has a repeated block length of 1. It is also represented as 81.10111... (ellipsis notation) which equals approximately 81.1011111 (decimal approximation)(*).

The recurring decimal 81.101 can be written as a ratio of two integers having 72991 as the numerator and 900 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.