What is 1.6428428428... as a Fraction?

1.6428 equals 82064995 as a fraction.

How do you turn 1.6428 repeating into a fraction?

Detailed Answer:

Step 1: To convert 1.6428 repeating into a fraction, begin writing this simple equation:

n = 1.6428 (equation 1)

Step 2: Notice that there are 3 digits in the repeating block (428) and 1 digit in the non-repeating part (6). Multiply both sides by 10⁴ = 10000.

10000 × n = 16428.428 (equation 2)

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

10000 × n = 16428.428
   10 × n = 1.6428
 9990 × n = 16412

164129990 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 2 (the GCF - greatest common factor).

n = 164129990 = 16412 ÷ 29990 ÷ 2 = 82064995. So,

1.6428 = 82064995 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 82064995 is also equal to 132114995 when expressed as a mixed number.

The repeating decimal 1.6428 (vinculum notation) has a repeated block length of 3. It is also represented as 1.6428428428... (ellipsis notation) which equals approximately 1.6428428428428428 (decimal approximation)(*).

The recurring decimal 1.6428 can be written as a ratio of two integers having 8206 as the numerator and 4995 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.