Alright, let's work through 7811 times 5382 step by step
7811 × 5382 = 5382 × (7811)
+ 5382 × 1 which equals 5382
+ 5382 × 10 that is equal 53820
+ 5382 × 800 that equals 4305600
+ 5382 × 7000 which equals 37674000

= 42038802
