Alright, let's work through 6373 times 1240 step by step
6373 × 1240 = 1240 × (6373)
+ 1240 × 3 resulting in 3720
+ 1240 × 70 that results in 86800
+ 1240 × 300 what gives us 372000
+ 1240 × 6000 that equals 7440000

= 7902520
