No problem, we've got 7920 and 4228 to multiply
7920 × 4228 = 4228 × (7920)
+ 4228 × 0 that is equal 0
+ 4228 × 20 what gives us 84560
+ 4228 × 900 which equals 3805200
+ 4228 × 7000 giving us 29596000

= 33485760
