What is 1.2153153153... as a Fraction?

1.2153 equals 13491110 as a fraction.

How do you turn 1.2153 repeating into a fraction?

Detailed Answer:

Step 1: To convert 1.2153 repeating into a fraction, begin writing this simple equation:

n = 1.2153 (equation 1)

Step 2: Notice that there are 3 digits in the repeating block (153) and 1 digit in the non-repeating part (2). Multiply both sides by 10⁴ = 10000.

10000 × n = 12153.153 (equation 2)

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

10000 × n = 12153.153
   10 × n = 1.2153
 9990 × n = 12141

121419990 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 = 121419990 = 12141 ÷ 99990 ÷ 9 = 13491110. So,

1.2153 = 13491110 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 13491110 is also equal to 12391110 when expressed as a mixed number.

The repeating decimal 1.2153 (vinculum notation) has a repeated block length of 3. It is also represented as 1.2153153153... (ellipsis notation) which equals approximately 1.2153153153153153 (decimal approximation)(*).

The recurring decimal 1.2153 can be written as a ratio of two integers having 1349 as the numerator and 1110 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.