Rich (BB code):

```
X1X0
+ Y1Y0
-----
Z2Z1Z0
```

If so, dont worry about the carry in and carry out part ok?

but i think i still need to use the multiplication answer for the table?

Rich (BB code):

```
1 carry in? like if we are adding? Now, that i think about it there is no carry in with multiplication!
110101
X 1101
------
101011001 thats what i ended up with. Probably, not right!
```

Rich (BB code):

```
X1X0
+ Y1Y0
----
Z2Z1Z0
X0 Y0 Carry Z0
0 0 0 0
1 0 0 1
0 1 0 1
1 1 1 0
X1 Y1 Carryin Carryout Z1
0 0 0 0 0
1 0 0 0 1
0 1 0 0 1
1 1 0 1 0
0 0 1 0 1
1 0 1 1 0
```

would the "carry in" be the result of 1+1 and the "carry out" be the result of the next carry result?

I think after we get the truth table done with the carry in and carry out we are to use boolean algebra like:

Rich (BB code):

```
Z1 = X1• Y1' • Carryin' + X1' • Y1• Carryin' + X1' • Y1' • Carryin + X1• Y1• Carryin
Carryout = X1• Y1• Carryin' + X1 • Y1' • Carryin + X1' • Y1• Carryin + X1 • Y1• Carryin
Z2 = Carryout
```