Alright, let's work through 7881 times 6940 step by step
7881 × 6940 = 6940 × (7881)
+ 6940 × 1 which equals 6940
+ 6940 × 80 that is equal 555200
+ 6940 × 800 which equals 5552000
+ 6940 × 7000 giving us 48580000

= 54694140
