Explanations:
The given expression is 7/20
You know that 7 is lesser than 20 and it cannot be divided by 20. You first write 0, add a point, then do 70/20. This can be shown mathematically as:
[tex]\begin{gathered} \frac{7}{20}=\text{ 0.} \\ To\text{ know what will you will write after the point join 0 to 7 and do:} \\ \frac{70}{20}=\text{ 3 remainder 10.} \\ \text{ } \end{gathered}[/tex]Join 0 to the remainder, 10. It becomes:
[tex]\frac{100}{20}=\text{ 5}[/tex]Note that in the first division, you got 0., then you got 3, then you got 5. Combine these three together, you will get:
[tex]\frac{7}{20}=\text{ 0.35}[/tex]