Alright, let's work through 4140 times 7951 step by step
4140 × 7951 = 7951 × (4140)
+ 7951 × 0 that equals 0
+ 7951 × 40 which equals 318040
+ 7951 × 100 that equals 795100
+ 7951 × 4000 producing 31804000

= 32917140
