We're going to solve 1871 multiplied by 1390
1871 × 1390 = 1390 × (1871)
+ 1390 × 1 resulting in 1390
+ 1390 × 70 yielding 97300
+ 1390 × 800 which equals 1112000
+ 1390 × 1000 resulting in 1390000

= 2600690
