Alright, let's work through 1580 times 6485 step by step
1580 × 6485 = 6485 × (1580)
+ 6485 × 0 yielding 0
+ 6485 × 80 that equals 518800
+ 6485 × 500 that equals 3242500
+ 6485 × 1000 which equals 6485000

= 10246300
