Alright, let's work through 6789 times 1890 step by step
6789 × 1890 = 1890 × (6789)
+ 1890 × 9 that equals 17010
+ 1890 × 80 what gives us 151200
+ 1890 × 700 that equals 1323000
+ 1890 × 6000 what gives us 11340000

= 12831210
