We're going to solve 7821 multiplied by 2407
7821 × 2407 = 2407 × (7821)
+ 2407 × 1 what gives us 2407
+ 2407 × 20 yielding 48140
+ 2407 × 800 resulting in 1925600
+ 2407 × 7000 producing 16849000

= 18825147
