No problem, we've got 8428 and 2340 to multiply
8428 × 2340 = 2340 × (8428)
+ 2340 × 8 that results in 18720
+ 2340 × 20 that equals 46800
+ 2340 × 400 what gives us 936000
+ 2340 × 8000 producing 18720000

= 19721520
