Alright, let's work through 2488 times 8111 step by step
2488 × 8111 = 8111 × (2488)
+ 8111 × 8 that equals 64888
+ 8111 × 80 that is equal 648880
+ 8111 × 400 yielding 3244400
+ 8111 × 2000 which equals 16222000

= 20180168
