No problem, we've got 9991 and 7680 to multiply
9991 × 7680 = 7680 × (9991)
+ 7680 × 1 that is equal 7680
+ 7680 × 90 which equals 691200
+ 7680 × 900 giving us 6912000
+ 7680 × 9000 that results in 69120000

= 76730880
