Let's calculate 8315 x 6440
8315 × 6440 = 6440 × (8315)
+ 6440 × 5 which equals 32200
+ 6440 × 10 which equals 64400
+ 6440 × 300 resulting in 1932000
+ 6440 × 8000 what gives us 51520000

= 53548600
