Alright, let's work through 6428 times 1143 step by step
6428 × 1143 = 1143 × (6428)
+ 1143 × 8 that equals 9144
+ 1143 × 20 which equals 22860
+ 1143 × 400 that is equal 457200
+ 1143 × 6000 that is equal 6858000

= 7347204
