Alright, let's work through 3931 times 7957 step by step
3931 × 7957 = 7957 × (3931)
+ 7957 × 1 resulting in 7957
+ 7957 × 30 yielding 238710
+ 7957 × 900 that results in 7161300
+ 7957 × 3000 what gives us 23871000

= 31278967
