No problem, we've got 6400 and 6328 to multiply
6400 × 6328 = 6328 × (6400)
+ 6328 × 0 that equals 0
+ 6328 × 00 what gives us 0
+ 6328 × 400 that is equal 2531200
+ 6328 × 6000 which equals 37968000

= 40499200
