What is 20.43076930769307693076930769... as a Fraction?

20.430769 equals 4086113199998 as a fraction.

How do you turn 20.430769 repeating into a fraction?

Detailed Answer:

Step 1: To convert 20.430769 repeating into a fraction, begin writing this simple equation:

n = 20.430769 (equation 1)

Step 2: Notice that there are 5 digits in the repeating block (30769) and 1 digit in the non-repeating part (4). Multiply both sides by 10⁶ = 1000000.

1000000 × n = 20430769.30769 (equation 2)

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

1000000 × n = 20430769.30769
     10 × n = 20.430769
 999990 × n = 20430565

20430565999990 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 5 (the GCF - greatest common factor).

n = 20430565999990 = 20430565 ÷ 5999990 ÷ 5 = 4086113199998. So,

20.430769 = 4086113199998 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 4086113199998 is also equal to 2086153199998 when expressed as a mixed number.

The repeating decimal 20.430769 (vinculum notation) has a repeated block length of 5. It is also represented as 20.4307693076930769... (ellipsis notation) which equals approximately 20.43076930769307693076930769 (decimal approximation)(*).

The recurring decimal 20.430769 can be written as a ratio of two integers having 4086113 as the numerator and 199998 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.