We're going to solve 4007 multiplied by 2105
4007 × 2105 = 2105 × (4007)
+ 2105 × 7 which equals 14735
+ 2105 × 00 that is equal 0
+ 2105 × 000 what gives us 0
+ 2105 × 4000 producing 8420000

= 8434735
