Alright, let's work through 3953 times 4642 step by step
3953 × 4642 = 4642 × (3953)
+ 4642 × 3 producing 13926
+ 4642 × 50 which equals 232100
+ 4642 × 900 giving us 4177800
+ 4642 × 3000 which equals 13926000

= 18349826
