[Math] Base three numbers and expanded form

Question

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

1. $22_3$
2. $212_3$
3. $12110_3$

Answer 1

Surely this means to expand them into base ten ...

So 22 in base three is actually 8 in base ten (this is 2 + (2*3)). 212 in base three is actually 14 in base ten (this is 2 + 1*3 + 2*9). 12110 in base three is actually 147 in base ten.