Alright, let's work through 1311 times 9983 step by step
1311 × 9983 = 9983 × (1311)
+ 9983 × 1 resulting in 9983
+ 9983 × 10 that is equal 99830
+ 9983 × 300 which equals 2994900
+ 9983 × 1000 that results in 9983000

= 13087713
