Alright, let's work through 7899 times 7993 step by step
7899 × 7993 = 7993 × (7899)
+ 7993 × 9 producing 71937
+ 7993 × 90 which equals 719370
+ 7993 × 800 giving us 6394400
+ 7993 × 7000 which equals 55951000

= 63136707
