Alright, let's work through 3902 times 2129 step by step
3902 × 2129 = 2129 × (3902)
+ 2129 × 2 what gives us 4258
+ 2129 × 00 yielding 0
+ 2129 × 900 producing 1916100
+ 2129 × 3000 that is equal 6387000

= 8307358
