To estimate Cedric's total expenses for the month by rounding each value to the nearest tens place, we can round the individual expenses as follows:
- Electric bill: $33.90 rounds to $30.
- TV streaming service: $24.99 rounds to $30.
- Rent: $538.95 rounds to $540.
Now we can add the rounded expenses together:
\[ 30 + 30 + 540 = 600 \]
Therefore, Cedric's estimated total expenses for the month is $600.