Alright, let's work through 7821 times 1831 step by step
7821 × 1831 = 1831 × (7821)
+ 1831 × 1 that results in 1831
+ 1831 × 20 that results in 36620
+ 1831 × 800 giving us 1464800
+ 1831 × 7000 yielding 12817000

= 14320251
