Alright, let's work through 3577 times 8315 step by step
3577 × 8315 = 8315 × (3577)
+ 8315 × 7 that is equal 58205
+ 8315 × 70 yielding 582050
+ 8315 × 500 that is equal 4157500
+ 8315 × 3000 yielding 24945000

= 29742755
