Two demos are available for those who want to practice conversion from base 10 to base 2 and two's complement, and vice versa.
The demos cover fractions and explain in detail how the conversion was executed.

1. Base 10 to binary conversion (accepts fractions, e.g. 10.85)
2. Binary to base 10 conversion (accepts fractions, e.g. 100.101)
3. Convert base 10 to two's complement