Alright, let's work through 7880 times 513 step by step
7880 × 513 = 513 × (7880)
+ 513 × 0 resulting in 0
+ 513 × 80 which equals 41040
+ 513 × 800 that equals 410400
+ 513 × 7000 that results in 3591000

= 4042440
