Student Help 3x Binary Multiplier Using Full Adder

[Vtiger5]

I've been assigned by my professor to make a binary multiplier using a 4 bit adder That goes up to 5 ( 1x3 , 2x3, 3x3, 4x3, 5x3 )

So I made an Adaption In Circuit maker from a 4x4 multiplier from around this site

But I decided to make one that goes up to 15x3, and I've come to a snag, Some operations work, others do not, I can't figure out what I've done wrong in the circuit I've made
Here Is the schematic:


(In the picture 5x3 [101x11] - Correct)

And A List Of Correct/Incorrect Operations:

1x11 = 11 - Correct
10x11 = 110 - Correct
11x11 = 100101 - Incorrect
100x11 = 1100 - Correct
101x11 = 1111 - Correct
110x11 = 101000 - Incorrect
111x11 = 101011 - Incorrect
1000x11 = 11000 - Correct
1001x11 = 11011 - Correct
1011x11 = 11110 - Correct
1100x11 = 111101 - Incorrect
1101x11 = 010010 - Incorrect
1110x11 = 110100 - Incorrect
1111x11 = 110111 - Incorrect

I thank all of you who took the time to read this, and I hope you can assist my issue.

 

[barry]

First of all, your picture is showing 1010 (xA) not 0101 (5). I think you may have your bits backwards. B1 is your least-significant-bit. B4 is most-signficant.

 

[Vtiger5]

Yeah that was the problem, Thank you for the help ^^