Alright, let's work through 3902 times 6451 step by step
3902 × 6451 = 6451 × (3902)
+ 6451 × 2 that is equal 12902
+ 6451 × 00 that results in 0
+ 6451 × 900 giving us 5805900
+ 6451 × 3000 what gives us 19353000

= 25171802
