Alright, let's work through 7814 times 2640 step by step
7814 × 2640 = 2640 × (7814)
+ 2640 × 4 which equals 10560
+ 2640 × 10 that is equal 26400
+ 2640 × 800 giving us 2112000
+ 2640 × 7000 giving us 18480000

= 20628960
