No problem, we've got 1800 and 5239 to multiply
1800 × 5239 = 5239 × (1800)
+ 5239 × 0 what gives us 0
+ 5239 × 00 producing 0
+ 5239 × 800 yielding 4191200
+ 5239 × 1000 resulting in 5239000

= 9430200
