Alright, let's work through 1857 times 6670 step by step
1857 × 6670 = 6670 × (1857)
+ 6670 × 7 resulting in 46690
+ 6670 × 50 that is equal 333500
+ 6670 × 800 yielding 5336000
+ 6670 × 1000 yielding 6670000

= 12386190
