Alright, let's work through 3100 times 1257 step by step
3100 × 1257 = 1257 × (3100)
+ 1257 × 0 what gives us 0
+ 1257 × 00 resulting in 0
+ 1257 × 100 that results in 125700
+ 1257 × 3000 that results in 3771000

= 3896700
