What is 5.12252525... as a Fraction?

5.1225 equals 507139900 as a fraction.

How do you turn 5.1225 repeating into a fraction?

Detailed Answer:

Step 1: To convert 5.1225 repeating into a fraction, begin writing this simple equation:

n = 5.1225 (equation 1)

Step 2: Notice that there are 2 digits in the repeating block (25) and 2 digits in the non-repeating part (12). Multiply both sides by 10⁴ = 10000.

10000 × n = 51225.25 (equation 2)

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

10000 × n = 51225.25
  100 × n = 5.1225
 9900 × n = 50713

n = 507139900 (answer)

5.1225 = 507139900 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 507139900 is also equal to 512139900 when expressed as a mixed number.

The repeating decimal 5.1225 (vinculum notation) has a repeated block length of 2. It is also represented as 5.12252525... (ellipsis notation) which equals approximately 5.122525252525 (decimal approximation)(*).

The recurring decimal 5.1225 can be written as a ratio of two integers having 50713 as the numerator and 9900 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.