We're going to solve 1977 multiplied by 4007
1977 × 4007 = 4007 × (1977)
+ 4007 × 7 what gives us 28049
+ 4007 × 70 what gives us 280490
+ 4007 × 900 what gives us 3606300
+ 4007 × 1000 yielding 4007000

= 7921839
