We're going to solve 3639 multiplied by 1979
3639 × 1979 = 1979 × (3639)
+ 1979 × 9 what gives us 17811
+ 1979 × 30 which equals 59370
+ 1979 × 600 which equals 1187400
+ 1979 × 3000 yielding 5937000

= 7201581
