Alright, let's work through 5131 times 8115 step by step
5131 × 8115 = 8115 × (5131)
+ 8115 × 1 that results in 8115
+ 8115 × 30 yielding 243450
+ 8115 × 100 giving us 811500
+ 8115 × 5000 giving us 40575000

= 41638065
