What is #86 * 77#?

1 Answer
George C.
May 4, 2016

#6622#

Explanation:

#8*7 = 56#

#6*7 = 42#

Broken down into small steps we find:

#86*7 = (80+6)*7 = (80*7)+(6*7) = (10*8*7)+(6*7)#

#= (10*56)+42= 560+42 = 602#

Then:

#86*77 = 86*7*11 = 602*11 = 602*(10+1) = (602*10)+602#

#= 6020+602 = 6622#

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