2 x 3 =6 3 x 4 = 12 4 x 5 = 20 5 x 6 = 30 6 x 7 = 42 9 x

9 X 10 = 90

You always multiply the nth number and (n+1)th number.

Here n =9

so n+1 = 9+1=10

So 9 X 10 =90

Please let me know if you have any questions and best me if you are satisfactory.

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