What is 3.91818... as a Fraction?

3.918 equals 431110 as a fraction.

How do you turn 3.918 repeating into a fraction?

Detailed Answer:

Step 1: To convert 3.918 repeating into a fraction, begin writing this simple equation:

n = 3.918 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (18) and 1 digit in the non-repeating part (9). Multiply both sides by 10³ = 1000.

1000 × n = 3918.18 (equation 2)

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

1000 × n = 3918.18
  10 × n = 3.918
 990 × n = 3879

3879990 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 = 3879990 = 3879 ÷ 9990 ÷ 9 = 431110. So,

3.918 = 431110 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 431110 is also equal to 3101110 when expressed as a mixed number.

The repeating decimal 3.918 (vinculum notation) has a repeated block length of 2. It is also represented as 3.9181818... (ellipsis notation) which equals approximately 3.91818181818 (decimal approximation)(*).

The recurring decimal 3.918 can be written as a ratio of two integers having 431 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.