Let's calculate 1242 x 8155
1242 × 8155 = 8155 × (1242)
+ 8155 × 2 that results in 16310
+ 8155 × 40 yielding 326200
+ 8155 × 200 that results in 1631000
+ 8155 × 1000 that equals 8155000

= 10128510
