No problem, we've got 4940 and 4165 to multiply
4940 × 4165 = 4165 × (4940)
+ 4165 × 0 which equals 0
+ 4165 × 40 that equals 166600
+ 4165 × 900 what gives us 3748500
+ 4165 × 4000 which equals 16660000

= 20575100
