We're going to solve 7779 multiplied by 1111
7779 × 1111 = 1111 × (7779)
+ 1111 × 9 giving us 9999
+ 1111 × 70 that is equal 77770
+ 1111 × 700 yielding 777700
+ 1111 × 7000 giving us 7777000

= 8642469
