No problem, we've got 3840 and 5321 to multiply
3840 × 5321 = 5321 × (3840)
+ 5321 × 0 giving us 0
+ 5321 × 40 producing 212840
+ 5321 × 800 that is equal 4256800
+ 5321 × 3000 giving us 15963000

= 20432640
