No problem, we've got 5905 and 2180 to multiply
5905 × 2180 = 2180 × (5905)
+ 2180 × 5 what gives us 10900
+ 2180 × 00 which equals 0
+ 2180 × 900 what gives us 1962000
+ 2180 × 5000 yielding 10900000

= 12872900
