We're going to solve 2107 multiplied by 4011
2107 × 4011 = 4011 × (2107)
+ 4011 × 7 what gives us 28077
+ 4011 × 00 what gives us 0
+ 4011 × 100 yielding 401100
+ 4011 × 2000 yielding 8022000

= 8451177
