Alright, let's work through 6991 times 159 step by step
6991 × 159 = 159 × (6991)
+ 159 × 1 giving us 159
+ 159 × 90 yielding 14310
+ 159 × 900 that is equal 143100
+ 159 × 6000 that is equal 954000

= 1111569
