Alright, let's work through 3155 times 6367 step by step
3155 × 6367 = 6367 × (3155)
+ 6367 × 5 yielding 31835
+ 6367 × 50 that is equal 318350
+ 6367 × 100 producing 636700
+ 6367 × 3000 what gives us 19101000

= 20087885
