Alright, let's work through 7905 times 3994 step by step
7905 × 3994 = 3994 × (7905)
+ 3994 × 5 that is equal 19970
+ 3994 × 00 that equals 0
+ 3994 × 900 which equals 3594600
+ 3994 × 7000 producing 27958000

= 31572570
