answersLogoWhite

0


First 9 X 10 is easy to calculate. Any number times 10 is that number with a 0 added.


9 X 10 = 90


Then you just add the 9 to it to have the same answer as if you multiplied 9 X 11.


90 + 9 = 99


or


9 X 11 = 99

User Avatar

Wiki User

15y ago

What else can I help you with?