Alright, let's work through 3135 times 6441 step by step
3135 × 6441 = 6441 × (3135)
+ 6441 × 5 that results in 32205
+ 6441 × 30 that results in 193230
+ 6441 × 100 that is equal 644100
+ 6441 × 3000 that is equal 19323000

= 20192535
