No problem, we've got 4203 and 921 to multiply
4203 × 921 = 921 × (4203)
+ 921 × 3 what gives us 2763
+ 921 × 00 yielding 0
+ 921 × 200 what gives us 184200
+ 921 × 4000 resulting in 3684000

= 3870963
