Alright, let's work through 7806 times 1557 step by step
7806 × 1557 = 1557 × (7806)
+ 1557 × 6 giving us 9342
+ 1557 × 00 which equals 0
+ 1557 × 800 giving us 1245600
+ 1557 × 7000 what gives us 10899000

= 12153942
