Alright, let's work through 6672 times 1991 step by step
6672 × 1991 = 1991 × (6672)
+ 1991 × 2 that results in 3982
+ 1991 × 70 that equals 139370
+ 1991 × 600 that is equal 1194600
+ 1991 × 6000 giving us 11946000

= 13283952
