Alright, let's work through 3720 times 2688 step by step
3720 × 2688 = 2688 × (3720)
+ 2688 × 0 that equals 0
+ 2688 × 20 that is equal 53760
+ 2688 × 700 what gives us 1881600
+ 2688 × 3000 what gives us 8064000

= 9999360
