I will explain to you how to do long multiplication.

First write the multiplication sum in columns for example 73 x 4 =

After that underline it

Next you have to times the numbers by the number you times it by so in 73 x 4  I have to times it by 4

Then you write it down

Underline it

And add the total up

there is your answer

 

Using the same method answer the following questions write them in a comment