Alright, let's work through 1251 times 6308 step by step
1251 × 6308 = 6308 × (1251)
+ 6308 × 1 that results in 6308
+ 6308 × 50 which equals 315400
+ 6308 × 200 resulting in 1261600
+ 6308 × 1000 which equals 6308000

= 7891308
