Alright, let's work through 8135 times 4954 step by step
8135 × 4954 = 4954 × (8135)
+ 4954 × 5 yielding 24770
+ 4954 × 30 giving us 148620
+ 4954 × 100 that equals 495400
+ 4954 × 8000 which equals 39632000

= 40300790
