Base three numbers and expanded form I need help understanding this. Write each of the following base three numerals in expanded notation.


*

*$22_3$

*$212_3$

*$12110_3$


If you are being asked to write numbers in the expanded notation for Base $3$ such as $112201_3$ (just a random number I made up) then you would need to write it like so (starting from the $3^5$th place, the 5th place of the digit) 
$$112201_3 = 1.3^5 + 1.3^4 + 2.3^3 + 2.3^2+ 0.3^1 + 1.3^0$$
Use this video to help yourself understand 
https://www.youtube.com/watch?v=vOyiHMa-mtQ
