What is the procedure for multiplying by a one digit number?

Example: 5x9=
5+5+5+5+5+5+5+5+5=45
so 5x9=45

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

The only number less than 8 that can equal 12 would be 6, 36 is the dividend