Alright, let's work through 3828 times 335 step by step
3828 × 335 = 335 × (3828)
+ 335 × 8 giving us 2680
+ 335 × 20 that equals 6700
+ 335 × 800 what gives us 268000
+ 335 × 3000 giving us 1005000

= 1282380
