Alright, let's work through 3630 times 641 step by step
3630 × 641 = 641 × (3630)
+ 641 × 0 what gives us 0
+ 641 × 30 that results in 19230
+ 641 × 600 producing 384600
+ 641 × 3000 yielding 1923000

= 2326830
