Alright, let's work through 5158 times 8155 step by step
5158 × 8155 = 8155 × (5158)
+ 8155 × 8 that is equal 65240
+ 8155 × 50 giving us 407750
+ 8155 × 100 giving us 815500
+ 8155 × 5000 that equals 40775000

= 42063490
