Alright, let's work through 9138 times 638 step by step
9138 × 638 = 638 × (9138)
+ 638 × 8 which equals 5104
+ 638 × 30 which equals 19140
+ 638 × 100 what gives us 63800
+ 638 × 9000 giving us 5742000

= 5830044
