We're going to solve 3689 multiplied by 2215
3689 × 2215 = 2215 × (3689)
+ 2215 × 9 resulting in 19935
+ 2215 × 80 yielding 177200
+ 2215 × 600 resulting in 1329000
+ 2215 × 3000 what gives us 6645000

= 8171135
