What is 17.87888... as a Fraction?

17.878 equals 16091900 as a fraction.

How do you turn 17.878 repeating into a fraction?

Detailed Answer:

Step 1: To convert 17.878 repeating into a fraction, begin writing this simple equation:

n = 17.878 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (8) and 2 digits in the non-repeating part (87). Multiply both sides by 10³ = 1000.

1000 × n = 17878.8 (equation 2)

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

1000 × n = 17878.8
 100 × n = 17.878
 900 × n = 16091

n = 16091900 (answer)

17.878 = 16091900 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 16091900 is also equal to 17791900 when expressed as a mixed number.

The repeating decimal 17.878 (vinculum notation) has a repeated block length of 1. It is also represented as 17.87888... (ellipsis notation) which equals approximately 17.8788888 (decimal approximation)(*).

The recurring decimal 17.878 can be written as a ratio of two integers having 16091 as the numerator and 900 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.