Answer:
count that many 9s by the number your multiplying by.
Explanation:
so example think of it like this =
9 x 9
9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 = 81
9 x 9 = 81
that easy ! just add the amount of 9s to the number your multiplying by . if u still need help, go on You Tube and search MathAntics .. he explains every different types of math amazing !