Alright, let's work through 8241 times 1580 step by step
8241 × 1580 = 1580 × (8241)
+ 1580 × 1 that results in 1580
+ 1580 × 40 resulting in 63200
+ 1580 × 200 giving us 316000
+ 1580 × 8000 producing 12640000

= 13020780
