Alright, let's work through 8500 times 5015 step by step
8500 × 5015 = 5015 × (8500)
+ 5015 × 0 that is equal 0
+ 5015 × 00 what gives us 0
+ 5015 × 500 that is equal 2507500
+ 5015 × 8000 that is equal 40120000

= 42627500
