Hello, shamonica!
Converting fractions to decimals . . . use long division.
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Example: $\displaystyle \frac{13}{20}$
Divide 13 by 20. Code:
0.6 5
---------
2 0 ) 1 3.0 0
1 2 0
-----
1 0 0
1 0 0
=====
Therefore: .$\displaystyle \frac{13}{20} \;=\;0.65$
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However, most fraction do not "come out even."
Example: $\displaystyle \frac{4}{11}$ Code:
0.3 6 3 6 ...
---------------
1 1 ) 4.0 0 0 0
3 3
---
7 0
6 6
---
4 0
3 3
---
7 0
Therefore: .$\displaystyle \frac{4}{11} \;=\;0.3636\hdots$
This can be written: .$\displaystyle 0.\overline{36}\:\text{ or }\:0.36\tfrac{4}{11}$