No problem, we've got 9999 and 4321 to multiply
9999 × 4321 = 4321 × (9999)
+ 4321 × 9 which equals 38889
+ 4321 × 90 producing 388890
+ 4321 × 900 that equals 3888900
+ 4321 × 9000 what gives us 38889000

= 43205679
