Let's calculate 4287 x 7145
4287 × 7145 = 7145 × (4287)
+ 7145 × 7 which equals 50015
+ 7145 × 80 that results in 571600
+ 7145 × 200 resulting in 1429000
+ 7145 × 4000 producing 28580000

= 30630615
