To do multiplication is to take (usually) two sets on numbers and put them together to make them one.
For example: let’s say you want to multiply 5 and 3
This means you do 5➕5➕5
Your answer would be 15.
5✖️3= 15
Now let’s say you want to multiply a two digit number
10✖️12
This means you add 10 together 12 times.
10. First do 0✖️2 which is 0 so put it at the bottom. Then 1✖️2 which is 2
x 12. Then do 1✖️0 and 1✖️1
——————
20
➕11x. You put a place holder in this case (x) which equals 0
———————
120
Then you are left with your answer
Hope this helps! :3