Alright, let's work through 3899 times 3944 step by step
3899 × 3944 = 3944 × (3899)
+ 3944 × 9 what gives us 35496
+ 3944 × 90 that equals 354960
+ 3944 × 800 that equals 3155200
+ 3944 × 3000 what gives us 11832000

= 15377656
