Alright, let's work through 3660 times 6830 step by step
3660 × 6830 = 6830 × (3660)
+ 6830 × 0 what gives us 0
+ 6830 × 60 resulting in 409800
+ 6830 × 600 which equals 4098000
+ 6830 × 3000 which equals 20490000

= 24997800
