Alright, let's work through 6900 times 2291 step by step
6900 × 2291 = 2291 × (6900)
+ 2291 × 0 resulting in 0
+ 2291 × 00 that results in 0
+ 2291 × 900 giving us 2061900
+ 2291 × 6000 that is equal 13746000

= 15807900
