Alright, let's work through 1559 times 8105 step by step
1559 × 8105 = 8105 × (1559)
+ 8105 × 9 yielding 72945
+ 8105 × 50 that equals 405250
+ 8105 × 500 producing 4052500
+ 8105 × 1000 that equals 8105000

= 12635695
