Show me how to do this on paper I need it right now

Answer:
Step-by-step explanation:
Billys mistake was when he multiplied the 80 by 12 instead of carrying the 1 from getting 160 from 80 x 2 he just put 16 and added 8 to it from 1 x 8.
Answer:
Hope this screenshot helps:
(If u want to just copy #2 here: The mistake that he made was that he didn't carry the one over to the 1 in the tenth area. So, instead he added it to the problem which he shouldn't have.)