We're going to solve 3945 multiplied by 7140
3945 × 7140 = 7140 × (3945)
+ 7140 × 5 that is equal 35700
+ 7140 × 40 resulting in 285600
+ 7140 × 900 giving us 6426000
+ 7140 × 3000 that is equal 21420000

= 28167300
