Alright, let's work through 7455 times 1143 step by step
7455 × 1143 = 1143 × (7455)
+ 1143 × 5 that equals 5715
+ 1143 × 50 that is equal 57150
+ 1143 × 400 that equals 457200
+ 1143 × 7000 producing 8001000

= 8521065
