Converting recurring decimal to a fraction

1. Apr 2, 2009

Mathysics

3.741 (41 is recurring)

but ii don't know how to work it out

thanks :)

2. Apr 2, 2009

sylas

3.74141414141... = 3.7 + 1.0101010101010... * 0.041

Can you figure out a fraction for 1.01010101010?

If so, you can proceed from there.

3. Apr 2, 2009

meiso

You could also try assigning the number to a variable, for example

n = 3.741414141...

If we multiply both sides of the above equation by 10, we have

10n = 37.41414141...

Try multiplying the original equation by another number, so that it might be possible to get rid of the repeating decimal part of the number by performing some arithmetic operation on two of the equations...

4. Apr 2, 2009

Mentallic

Use the geometric series formula or, if you don't know what that is, do it algebraically as so:

To convert 0.52222... into a fraction

let x=0.52222... (1)
10x=5.22222... (2)
(2) - (1)
9x = 5.2222...-0.5222 = 4.7
Therefore x = 4.7/9 = 47/90

Try apply this idea to your question.