Alright, let's work through 6729 times 7971 step by step
6729 × 7971 = 7971 × (6729)
+ 7971 × 9 resulting in 71739
+ 7971 × 20 that is equal 159420
+ 7971 × 700 giving us 5579700
+ 7971 × 6000 which equals 47826000

= 53636859
