What is 1.172727272... as a Fraction?

1.172 equals 129110 as a fraction.

How do you turn 1.172 repeating into a fraction?

Detailed Answer:

Step 1: To convert 1.172 repeating into a fraction, begin writing this simple equation:

n = 1.172 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (72) and 1 digit in the non-repeating part (1). Multiply both sides by 10³ = 1000.

1000 × n = 1172.72 (equation 2)

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

1000 × n = 1172.72
  10 × n = 1.172
 990 × n = 1161

1161990 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 = 1161990 = 1161 ÷ 9990 ÷ 9 = 129110. So,

1.172 = 129110 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 129110 is also equal to 119110 when expressed as a mixed number.

The repeating decimal 1.172 (vinculum notation) has a repeated block length of 2. It is also represented as 1.1727272... (ellipsis notation) which equals approximately 1.17272727272 (decimal approximation)(*).

The recurring decimal 1.172 can be written as a ratio of two integers having 129 as the numerator and 110 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.