Alright, let's work through 7920 times 3968 step by step
7920 × 3968 = 3968 × (7920)
+ 3968 × 0 that equals 0
+ 3968 × 20 that equals 79360
+ 3968 × 900 which equals 3571200
+ 3968 × 7000 that equals 27776000

= 31426560
