Alright, let's work through 1312 times 9887 step by step
1312 × 9887 = 9887 × (1312)
+ 9887 × 2 that results in 19774
+ 9887 × 10 producing 98870
+ 9887 × 300 producing 2966100
+ 9887 × 1000 that results in 9887000

= 12971744
