Question 1192371
<pre>

I'll do no. 2 for you, you should then be able to do the rest.

2) 321(6) + 1255(6)

Step by step:

5+1 = 6 = 0(6) with a 1 carried:
  1
1255
 321
----
   0


1+5+2 = 8 = 2(6) with a 1 carried:

 1
1255
 321
----
  20 


1+3+2 = 6 = 0(6) with a 1 carried:

1
1255
 321
----
 020

1+1 = 2 = 2(6):

1255
 321
----
2020(6)


Check:  321(6) = 3*6^2+2*6+1 = 121(10)
       1255(6) = 1*6^3+2*6^2+5*6+5 = 323(10)
                    
       121(10)+323(10) = 444(10)

   2020(6) = 2*6^3 + 2*6 = 432 + 12 = 444(10)  (ok)