No problem, we've got 3581 and 4240 to multiply
3581 × 4240 = 4240 × (3581)
+ 4240 × 1 that is equal 4240
+ 4240 × 80 giving us 339200
+ 4240 × 500 resulting in 2120000
+ 4240 × 3000 that equals 12720000

= 15183440
