What is 1.288181... as a Fraction?

1.2881 equals 14171100 as a fraction.

How do you turn 1.2881 repeating into a fraction?

Detailed Answer:

Step 1: To convert 1.2881 repeating into a fraction, begin writing this simple equation:

n = 1.2881 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (81) and 2 digits in the non-repeating part (28). Multiply both sides by 10⁴ = 10000.

10000 × n = 12881.81 (equation 2)

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

10000 × n = 12881.81
  100 × n = 1.2881
 9900 × n = 12753

127539900 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 = 127539900 = 12753 ÷ 99900 ÷ 9 = 14171100. So,

1.2881 = 14171100 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 14171100 is also equal to 13171100 when expressed as a mixed number.

The repeating decimal 1.2881 (vinculum notation) has a repeated block length of 2. It is also represented as 1.28818181... (ellipsis notation) which equals approximately 1.288181818181 (decimal approximation)(*).

The recurring decimal 1.2881 can be written as a ratio of two integers having 1417 as the numerator and 1100 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.