Alright, let's work through 1815 times 7580 step by step
1815 × 7580 = 7580 × (1815)
+ 7580 × 5 that equals 37900
+ 7580 × 10 resulting in 75800
+ 7580 × 800 that is equal 6064000
+ 7580 × 1000 what gives us 7580000

= 13757700
