Alright, let's work through 7840 times 6815 step by step
7840 × 6815 = 6815 × (7840)
+ 6815 × 0 that equals 0
+ 6815 × 40 resulting in 272600
+ 6815 × 800 that results in 5452000
+ 6815 × 7000 that equals 47705000

= 53429600
