Alright, let's work through 3610 times 391 step by step
3610 × 391 = 391 × (3610)
+ 391 × 0 what gives us 0
+ 391 × 10 giving us 3910
+ 391 × 600 what gives us 234600
+ 391 × 3000 yielding 1173000

= 1411510
