Alright, let's work through 7810 times 4200 step by step
7810 × 4200 = 4200 × (7810)
+ 4200 × 0 which equals 0
+ 4200 × 10 yielding 42000
+ 4200 × 800 giving us 3360000
+ 4200 × 7000 that is equal 29400000

= 32802000
