Alright, let's work through 7142 times 8040 step by step
7142 × 8040 = 8040 × (7142)
+ 8040 × 2 that results in 16080
+ 8040 × 40 what gives us 321600
+ 8040 × 100 what gives us 804000
+ 8040 × 7000 that results in 56280000

= 57421680
