Alright, let's work through 3660 times 630 step by step
3660 × 630 = 630 × (3660)
+ 630 × 0 resulting in 0
+ 630 × 60 resulting in 37800
+ 630 × 600 that results in 378000
+ 630 × 3000 which equals 1890000

= 2305800
