Alright, let's work through 1821 times 8755 step by step
1821 × 8755 = 8755 × (1821)
+ 8755 × 1 which equals 8755
+ 8755 × 20 giving us 175100
+ 8755 × 800 that results in 7004000
+ 8755 × 1000 that results in 8755000

= 15942855
