What is 15.120888... as a Fraction?

15.1208 equals 170111125 as a fraction.

How do you turn 15.1208 repeating into a fraction?

Detailed Answer:

Step 1: To convert 15.1208 repeating into a fraction, begin writing this simple equation:

n = 15.1208 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (8) and 3 digits in the non-repeating part (120). Multiply both sides by 10⁴ = 10000.

10000 × n = 151208.8 (equation 2)

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

10000 × n = 151208.8
 1000 × n = 15.1208
 9000 × n = 136088

1360889000 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 8 (the GCF - greatest common factor).

n = 1360889000 = 136088 ÷ 89000 ÷ 8 = 170111125. So,

15.1208 = 170111125 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 170111125 is also equal to 151361125 when expressed as a mixed number.

The repeating decimal 15.1208 (vinculum notation) has a repeated block length of 1. It is also represented as 15.120888... (ellipsis notation) which equals approximately 15.12088888 (decimal approximation)(*).

The recurring decimal 15.1208 can be written as a ratio of two integers having 17011 as the numerator and 1125 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.