Alright, let's work through 9123 times 7981 step by step
9123 × 7981 = 7981 × (9123)
+ 7981 × 3 which equals 23943
+ 7981 × 20 yielding 159620
+ 7981 × 100 that equals 798100
+ 7981 × 9000 what gives us 71829000

= 72810663
