What is 81.13333... as a Fraction?

81.133 equals 121715 as a fraction.

How do you turn 81.133 repeating into a fraction?

Detailed Answer:

Step 1: To convert 81.133 repeating into a fraction, begin writing this simple equation:

n = 81.133 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (3) and 2 digits in the non-repeating part (13). Multiply both sides by 10³ = 1000.

1000 × n = 81133.3 (equation 2)

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

1000 × n = 81133.3
 100 × n = 81.133
 900 × n = 73020

73020900 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 60 (the GCF - greatest common factor).

n = 73020900 = 73020 ÷ 60900 ÷ 60 = 121715. So,

81.133 = 121715 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 121715 is also equal to 81215 when expressed as a mixed number.

The repeating decimal 81.133 (vinculum notation) has a repeated block length of 1. It is also represented as 81.13333... (ellipsis notation) which equals approximately 81.1333333 (decimal approximation)(*).

The recurring decimal 81.133 can be written as a ratio of two integers having 1217 as the numerator and 15 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.