Let's calculate 2123 x 7857
2123 × 7857 = 7857 × (2123)
+ 7857 × 3 which equals 23571
+ 7857 × 20 that results in 157140
+ 7857 × 100 that results in 785700
+ 7857 × 2000 giving us 15714000

= 16680411
