Respuesta :
Answer:
81
Step-by-step explanation:
9x1=9
9x2=18
9x3=27
9x4=36
9x5=45
9x6=54
9x7=63
9x8=72
Just add Nine
72+9=81 which mean
9x9=81 I know you already knew the answer but for kids that didn't know just trying to make it easier Good luck with Math