No problem, we've got 9271 and 8390 to multiply
9271 × 8390 = 8390 × (9271)
+ 8390 × 1 what gives us 8390
+ 8390 × 70 which equals 587300
+ 8390 × 200 which equals 1678000
+ 8390 × 9000 that results in 75510000

= 77783690
