Alright, let's work through 6831 times 4321 step by step
6831 × 4321 = 4321 × (6831)
+ 4321 × 1 what gives us 4321
+ 4321 × 30 which equals 129630
+ 4321 × 800 which equals 3456800
+ 4321 × 6000 which equals 25926000

= 29516751
