No problem, we've got 4005 and 1011 to multiply
4005 × 1011 = 1011 × (4005)
+ 1011 × 5 what gives us 5055
+ 1011 × 00 resulting in 0
+ 1011 × 000 that results in 0
+ 1011 × 4000 resulting in 4044000

= 4049055
