Alright, let's work through 3955 times 9963 step by step
3955 × 9963 = 9963 × (3955)
+ 9963 × 5 that is equal 49815
+ 9963 × 50 which equals 498150
+ 9963 × 900 that equals 8966700
+ 9963 × 3000 what gives us 29889000

= 39403665
