Alright, let's work through 1586 times 7870 step by step
1586 × 7870 = 7870 × (1586)
+ 7870 × 6 that equals 47220
+ 7870 × 80 producing 629600
+ 7870 × 500 that equals 3935000
+ 7870 × 1000 what gives us 7870000

= 12481820
