Multisim multiplication problem

[exolorkistis]

Hello everyone.so i am doing my thesis and my subject is to make a circuit that get some values from registers, those values are suppose to be sides of shapes like a square  or a rectangle and then compare those sides to find out if it is a square or a rectangle and after that find their area and display it in 7 segment display.im doing ok  until the point that i have to multiply them to find the area.as you will see in the attachement my circuit stops at some leds which i have put to see if it works corectly and it does.Now my problem is that my teacher told me to use adder and shift left method for the multiplication and i dont know how to make that circuit i have searched all over the internet and i havent found anything similar to what i need.all i know is that i have to make a circuit that takes 2x 4bit binary numbers and multiply them using shift and adder.if anyone can help me it would be much appreciated thank you looking forward to hearing from someone 

[A-Guz-Man]

Hi exolorkistis,

Do you have to use only that method? There are tons on google to do what you are looking for: https://www.google.com/search?biw=1680&bih=929&tbm=isch&sa=1&ei=k53zWcePA87EjwPjnIKICw&q=multiply+ci...

[exolorkistis]

Unfortunately yeah thats the way i am supposed to make it.i have already found online the flow chart diagram but myy problem is that  i cant figure out how to  make it in multisim

,for example in the flow chart there is a control unit for the circuit.what is the control unit in multisim thats one of the things i dnt get

[A-Guz-Man]

I can't read well enough from your image, are you using 74LS194? If you are using the binary multiplier method there is no necessity to have a control unit or somehting to "hold" the partial results. 

https://forums.ni.com/t5/Multisim-and-Ultiboard/Binary-multiplication/td-p/2406230

What method/flow chart are you using?