We're going to solve 6311 multiplied by 3870
6311 × 3870 = 3870 × (6311)
+ 3870 × 1 what gives us 3870
+ 3870 × 10 giving us 38700
+ 3870 × 300 that results in 1161000
+ 3870 × 6000 which equals 23220000

= 24423570
