What is 20.40333... as a Fraction?

20.403 equals 6121300 as a fraction.

How do you turn 20.403 repeating into a fraction?

Detailed Answer:

Step 1: To convert 20.403 repeating into a fraction, begin writing this simple equation:

n = 20.403 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (3) and 2 digits in the non-repeating part (40). Multiply both sides by 10³ = 1000.

1000 × n = 20403.3 (equation 2)

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

1000 × n = 20403.3
 100 × n = 20.403
 900 × n = 18363

18363900 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 3 (the GCF - greatest common factor).

n = 18363900 = 18363 ÷ 3900 ÷ 3 = 6121300. So,

20.403 = 6121300 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 6121300 is also equal to 20121300 when expressed as a mixed number.

The repeating decimal 20.403 (vinculum notation) has a repeated block length of 1. It is also represented as 20.40333... (ellipsis notation) which equals approximately 20.4033333 (decimal approximation)(*).

The recurring decimal 20.403 can be written as a ratio of two integers having 6121 as the numerator and 300 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.