Alright, let's work through 3581 times 995 step by step
3581 × 995 = 995 × (3581)
+ 995 × 1 that is equal 995
+ 995 × 80 what gives us 79600
+ 995 × 500 that equals 497500
+ 995 × 3000 giving us 2985000

= 3563095
