Question

what pattern can you use to multiply a number and 9 if you know 10 times the number? give an example.

9x10=90
Bryce
what pattern can you use to multiply a number and 9 if you know 10 times the number? Give an example.
Bryce
9x10=90
Kimora
What's 90 times 3
Andre
9 x 11 = 110 - 11