Alright, let's work through 9001 times 7109 step by step
9001 × 7109 = 7109 × (9001)
+ 7109 × 1 what gives us 7109
+ 7109 × 00 yielding 0
+ 7109 × 000 which equals 0
+ 7109 × 9000 that equals 63981000

= 63988109
