Let's calculate 6359 x 6399
6359 × 6399 = 6399 × (6359)
+ 6399 × 9 what gives us 57591
+ 6399 × 50 resulting in 319950
+ 6399 × 300 that equals 1919700
+ 6399 × 6000 what gives us 38394000

= 40691241
