No problem, we've got 2425 and 7821 to multiply
2425 × 7821 = 7821 × (2425)
+ 7821 × 5 giving us 39105
+ 7821 × 20 producing 156420
+ 7821 × 400 what gives us 3128400
+ 7821 × 2000 that is equal 15642000

= 18965925
