We're going to solve 2145 multiplied by 3870
2145 × 3870 = 3870 × (2145)
+ 3870 × 5 that is equal 19350
+ 3870 × 40 that is equal 154800
+ 3870 × 100 resulting in 387000
+ 3870 × 2000 that results in 7740000

= 8301150
